If I'm designing a new shape for my guitars I'll draw it out the curves of the rim on a large sheet of paper. Once I've shaped my forms from this then I don't save the paper. Other than that I don't draw out any plans. I take notes on various important dimensions, but that's all.
Regarding the depth of guitars, for me it's not an analytical issue. I just pay attention to the dimensions and other details I can observe whenever I pick up any guitar, so over time I have many ideas about what I want to do.
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