I draw up my own plans on a drafting table with large poster cards in detail then cut out the required mold , half the fun I think in building is designing something yourself.
As for depth, I pretty much have a general idea of how deep I want it based on the model, shape and woods used for the way I want it to sound and feel in my hands, Cases I think have been tailored to fit the most commonly recognizable sizes, depths etc.
A shallower bodied guitar can still have nice sustain, but will lack the volume of a deeper instrument, if I understood your question correctly.
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