Technical help replacing rear quarters on 1960 Chevy

Hi everyone in the next few weeks I will attempt to replace the rear quarters on a 1960
El Camino Ive done small rust repairs before and have all the equipment I need to carry out the work. Does anybody have any links to a video or reference books that might help me out.
I have the reproduction full quarters that come in 2 pieces for each side.
Ive watched a couple of videos online on various cars and they usually do a lap joint on the upper cut line is this recommended I can see how this would be easier to weld and don't have to cut the replacement as accurate as a butt joint and less distortion when welding Is this the correct method?
What has me a little worried is fabricating the inner sheet metal if its rusted or thin
have other Hambers attempted this and how difficult was it?
Thanks in advance

 

Take your time removing the old parts as they can be used for reference. It is a lot easier to make a part like the inner wheel well lip if you have something to reference.

Butt welding allows for finishing the weld after it has been made. Lap welding will not due to multiple layers of steel.
Preferably the weld will need to be stretched after it is made.

Go slow in your fitting process. More time spent before welding = less work after.

Wheel wells should not be a problem but depending on your tools may require you to mske them in several pieces. If possible make the patches to the lip during the 1/4 fitting process then install and weld the wheel well patches after welding the outside skin. This will allow access to the welded 1/4 for metal finishing.

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Have you tried the parts on the car? Last I knew the replacement panels were for a sedan. They were too short at the rear for Camino and wagons. You need to stretch them a bit. That being said, butt welding is the A+ method for repair. It is the desired way to do it for restoration. I doubt most collision shops would butt weld anything. Factory panels are all overlap. I think it depends on your skill level how you do it.