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The biggest issue you'll have is validating alignment once it is built
Do you mean the frame or the jig? I'm puzzling over what adjustment I need to build into my jig design to bring everything into alignment before loading the tubes. I suspect that having a fixed feature (probably the bottom of the head tube) and then threaded lateral adjustment for the BB, seat tube top and rear axle will the best way to handle it.
That then got me thinking about making tube blocks for mitring on my lathe, and how I might make and fixture those...
hiraethus
@retrodirect/glowbike
I've just lasercut a framejig from 5mm plate. The biggest issue you'll have is validating alignment once it is built. I did it via the long route using angle finders etc. for now. I'm currently figuring out how to make a laser aligner for this purpose.
I used wheels from a 3d printer on eccentric mounting nuts in place of a linear rail system. It holds alignment and has no slop. I'll update with photos of it assembled when I get into the workshop tomorrow eve.