re: guitars

A couple of decisions you will need to make, 1) scale, their are different scales used in fret placement. The two major types are fender and Gibson. 2) their are two different joinery options for attaching the neck, bolt on or, set thru. Each of these decisions has an effect on sound, look, playability, hardware, and the overall appeal to players. Ie; some players will only play on a Gibson scale but could care less about how the neck is connected, but want a very radical curve in the neck profile. When making a custom instrument for someone I usually ask what they are playing now and why, this will give you overall design decisions then you can get creative with various components from their. I hope this helps.