I was going to let that slide...
Are the kits following any radius/taper?
Here's what I did to get my first few templates...
I used some sacrifice stock at about .060, precut very much like in your diagram (you're on the right track). I bent the fake sides then made a fake frame with ~3/16" neck and tail blocks. I made an OM frame as a middle of the road size.
I then got the radius right with the radius sanding dish, disassembled the fake frame, flattened a side on the hot pipe, (a few short minutes work at .060), then flattened it completely with an iron.
Then I decided what I wanted my final depth to be at neck and tail for the next guitar, whatever model it was, and used the OM template adjusted for depth at each end. Then I'd make a real guitar, sand it with the radius dish, make a construction paper template of the sides and adjust for depth at each end and tranfer it to 1/4" mdf, and voila, template for that model.
Grunt work, but that's mostly what this field is about.
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