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Technical Help me build my trunk floor?

Discussion in 'The Hokey Ass Message Board' started by Busmania, Jun 26, 2025.

  1. Busmania
    Joined: Oct 16, 2022
    Posts: 174

    Busmania
    Member
    from Denver

    I have some ideas but I’ve never done this before. Half of the floor is cut out and I plan to cut out all the way to where it drops down (where the DEWALT tool is in the photo, all that will be cut out).

    I sort of have a plan but am sort of hesitant so I figured I’d ask yall.

    My plan is to get the sheet metal shaped up, then take it somewhere to have some grooves put in it for strength. I don’t have the tooling for that but should be able to handle everything else.


    image.jpg
     
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  2. alchemy
    Joined: Sep 27, 2002
    Posts: 22,275

    alchemy
    Member

    I bought a Harbor Freight bead roller (real cheapie) at a swap meet for maybe $20 once. Even that little thing could roll the beads you’ll need in your floor. Every man should have some sheetmetal tools. Start with the cheap stuff and get better stuff as you improve your skills.
     
  3. I recently made one for a '40 Plymouth. Sorta like you described but I have a Harbor Freight bead roller and rolled my own.

    IMG_0661.jpg
     
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  4. If you used 16 guage metal would you need bead rolling? Or add another cross brace. Is anything going in there- ie battery or gas tank, or just lawn chairs?
     
  5. Busmania
    Joined: Oct 16, 2022
    Posts: 174

    Busmania
    Member
    from Denver

    Thanks yall. I’m always looking for a reason to find new tools so I’ll look into that.

    my battery will be in there but not really anything else. Lawn chairs are certainly too heavy. I want to finish the trunk to cut some noise down (no interior currently). I cut the first half out months ago because I was tired of looking at rusted super dented shitty metal. Now that I have the gas tank out (it was leaking), it’s a good time to make sparky sparky back there and finish it up.

    original ford metal is 18 gauge right? I’d like to use the same gauge metal.

    I also am using the original floor to frame mounting blocks that were in the original floor. Will use them under a 1x2 tube where the original brace crosses under the floor. It’s hard to see in my original photo but it’s sitting in place. I’ll work on a better photo.

    my biggest hold up is how to mimick the side fender wall contours while mocking things up and ultimately cutting the new metal out (from a template I’m hoping to build)?
     
    Tow Truck Tom likes this.
  6. lostone
    Joined: Oct 13, 2013
    Posts: 3,440

    lostone
    Member
    from kansas

    Here's one I built, I took out the big wheel well for the spare tire because the customer wanted it gone and a flat floor instead.

    The only exotic tool was a harbor freight bead roller that I stiffened up.

    I even built the little filler panel in front of the main floor section.... here's a couple pics...

    20210702_141057.jpg 20210705_084158.jpg
     
  7. catdad49
    Joined: Sep 25, 2005
    Posts: 6,877

    catdad49
    Member

    Sheetmetal guys, do you need to cut the piece oversize to allow for the bead rolling? Thanks, Carp.
     
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  8. alchemy
    Joined: Sep 27, 2002
    Posts: 22,275

    alchemy
    Member

    I would, especially if some of the beads are near an edge. Course I always cut parts big and sneak up on the final size. I hate gaps.
     
  9. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 10,591

    theHIGHLANDER
    Member

    catdad49 likes this.
  10. https://www.jalopyjournal.com/forum/threads/finally-starting-on-the-wife’s-56.1135206/

    Cheap modified HF bead roller.
    make an accurate template.
    I use magnets to hold the poster board in place. Make reference marks on the template that line up with marks the car.
    Lay the template on sheet metal. I use the magnets to hold it and transfer the reference marks. Use a spring loaded lunch to transfer detail from the template.
    Start making parts
     
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  11. miker98038
    Joined: Jan 24, 2011
    Posts: 1,506

    miker98038
    ALLIANCE MEMBER

    CAD will really help. Cardboard Aided Design. Masking tape and cardboard, way cheaper than sheet metal. The guys that are good don’t need it. I, and probably you, do.
     
    Last edited: Jun 27, 2025
  12. It seems that the much modified and referred to Harbor Freight bead roller has been discontinued...but you can still pick up a version through Amazon (and others no doubt) for a bit more than a couple hundred dollars. This is likely way cheaper than finding someone willing to take on the task for you at a shop rate. It's pretty straight forward. cut your panel slightly oversized, determine what pattern you want to roll in, mark, bead roll, test fit, cut to proper size and weld in. It looks like the toughest part of the job (the tool tray) is already in good shape. Don't worry about not having done it before...after doing this one, you'll have done it.

    Below are a few photos from my build thread on our cabriolet...it was in far worse condition than yours...but piece by piece it comes together.

    Good luck and happy building.
    20200229_163337_resized.jpg 20200323_144635_resized.jpg 20200327_161806_resized.jpg
     
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  13. Modified HF roller. Jegs, summit, Amazon, Eastwood sell the same thing. It’s crap u til you modify it.
    IMG_2321.jpeg
    the wife rolling while I guide.
    Also made on that offshore junky roller
    IMG_2049.jpeg
    make a pattern
    IMG_1966.jpeg
    transfer over to steel
    IMG_1967.jpeg
    start rolling and banging
    IMG_1987.jpeg IMG_1980.jpeg IMG_1979.jpeg IMG_1971.jpeg IMG_1972.jpeg IMG_1993.jpeg
     
    Last edited: Jun 27, 2025
  14. jnaki
    Joined: Jan 1, 2015
    Posts: 10,981

    jnaki

    upload_2025-6-28_4-26-12.png

    Hello,


    If the floor is going top be carpeted, then put in the floor you want, you have some cross bracing. 18 gauge, single sheet on top of your bracing and a couple more evenly spaced out. That should give you plenty of strength and a solid feel, No need for bead rolling as it will be carpeted on top.

    Now, it will be solid, quiet and add extra support for the trunk.

    Jnaki

    Plus, if a smooth floor is necessary, whether under the removable carpeting or plain, the one piece floor will be the complete unit. You are able to measure the complete sheet metal to fit the whole floor space.
    Not that you need to have a flat floor in the rear, but it seems like an easier fit and installation.



    Note:
    upload_2025-6-28_4-27-1.png I never liked the ribbed floor of my flathead 1940 Ford Sedan Delivery. It was an awful feeling when trying to go to sleep in a sleeping bag. No air mattresses, just a ribbed floor that was uncomfortable. But, as teenagers, it was the adventure that overcame the “small stuff” that made going on those long road trips worthwhile. Yes, it was made for sliding in boxes or commercial stuff, so the ribs were necessary. But, sleeping is another item for teenage surfers on a long, overnight, road trip excursion.
    upload_2025-6-28_4-28-2.png
    Later on, when we got the second 327 powered 1940 Ford Sedan Delivery, it had a carpeted rear floor area, but we could still feel the ribs and that was not good. Eventually, we had air mattresses like other folks to cushion the hard ribs felt through the sleeping bags. Although it was a 20 something set of bodies, we liked a little comfort for the overnight stays. Long or short… YRMV

     
  15. 34Phil
    Joined: Sep 12, 2016
    Posts: 691

    34Phil
    Member

    post on here a long time ago where someone cut a slot in MDF, then used a round solid bar and hammer to pound ribs in the sheet metal.
     
    X-cpe likes this.
  16. Add an old steering wheel in place of the crank. Helps ease the rolling
     
    anthony myrick likes this.
  17. nrgwizard
    Joined: Aug 18, 2006
    Posts: 3,011

    nrgwizard
    Member
    from Minn. uSA

    If you haven't fixed the old gas tank yet, nor started w/the replacement flooring, you might consider an early('64-ish -> '66 at least) mustang fuel tank. The top of the tank doubled as a trunk floor. TANKS repops them. It might just fit in the trunk-hole & solve 2 problems at once. Moving the brace wouldn't be a big deal.
    Marcus...
     

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