Hello! I am attempting a bass design sometime this summer, and I have been planning it out in CAD. It's a prototype bass that I may hope to produce someday if I ever am able to (Steinberger/Chapman inspired minimalism, but less brutalist). I may make another post regarding my design and whether my choices towards it are sensible or not (I'm trying a lot of different things with it that hopefully benefit the player). It has all went smoothly so far, but I've hit a large rock in the road. Before I explain my problem, it's important to know that I am modeling my bass off of a 34" scale length, and using a neck pocket for a 20 fret Jazz Bass neck (I don't have the skill or resources to make a custom neck). The issue comes when I try to place everything on the body, like the pickup cavity and where the bridge will be. Essentially, I can never know where to place anything in relation to the nut or bridge, because the neck pocket is dependent on the length of the Jazz Bass neck. If I was making my own neck and pocket, this wouldn't be an issue, but it seems I cannot find the actual length of a jazz neck from the nut to the very heel. Am I missing something here? Do I absolutely need to know the dimensions of the neck in order to properly align where the bridge/pickup is? I'd imagine there is some sort of logical/mathematical definition for the nut-to-heel length of a jazz bass, but I haven't seen it.