Technical Inside patch panel

Hey guys was having a few pops in the garage and got to thinking.
Is it possible to patch the roof line of my 56 f100 from the inside. Here is a pic of what im talking about

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Not sure what you mean by from the inside. The rotted metal needs to be cut out and replaced with new metal welded in. Any type of patch from the inside without cutting out the rust would be temporary at best.

 

Anytips on making that patch..how to make the bend

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If your plan was to just stuff some sheet metal on the inside weld it from the outside then bondo over it. Bad idea, moisture will get between the 2 and rust will surface again rapidly if it's a wet region.
Explaining metal forming on a board isn't the most practical thing especially if you never formed sheet metal, you better find something (fender, 1/4 panel, roof or whatever) that has that shape already formed cut to size and **** weld it.

 

There ya go.
I fixed a rear fender once with a piece cut off the front of a metal tool box, and a friend of mine made a firewall out of the door panel on a refrigerator.
"Necessity is the Mother of Invention"

 

Not a hard patch to make with basic sheet metal forming tools (shrinker/stretcher, shot bag, ect) but pretty tough if you don't have access to them. 3 choices, start picking up the tools necessary and learn how to use them, do like chrisp suggest or farm that part of the job out.

 

Or, trade some favors with someone who can help you out- everyone doesn't need to buy every tool in the book. Find a local guy with the knowhow and ask for help; there's a million ways to pay back the favor ( clean parts, help in his garage doing stuff when an extra pair of hands are needed, buy beer and pizza, get a gift card from a local coffee shop, etc.)

 

Another option would be to patch it yourself providing you aren't too adverse to using body filler (Bondo or equal). First, cut out the really rusted parts of the roof and use a Scotch pad wheel thing to remove the rest of the rust and paint, etc. from the inside of the roof for at least 1" around the hole. Then take a piece of medium density fiberboard (MDF) that you can get at a home supply store and carve out a "trench" of sorts that is more or less the same contour as the pieces you want to replace. Then take a piece of s**** sheet metal and a small ballpein hammer and pound the sheet metal into the trench. What you will have left is a rough approximation of the missing piece of the roof. This can then be welded into the hole. You can also do the same sort of metal forming but using a male (rather than female) mold or buck as its known. Regardless of which method you use, make it so that's just a little lower than the surrounding roof so that when you finish it with filler, it will be brought up to the same level. Either way, weld into the inside and then you use body filler outside and finish as usual.