Hey! Coincidentally, my latest obsession has been creating a scaled-up bass body for this guitar, the Washburn AF40V. You just asked the question I was about to post!
For this, I'm thinking I'm going to take some measurements from the pictures, make some cardboard body shapes, and refine it until it looks/feels right.
Of course, this is a special body so it might not apply to a standard curved bass body.