That bass is Claro Walnut top and back with Mahogany core and Maple highlights. The neck is Maple, Macassar Ebony, and Purpleheart. One cool thing I did with that bass is the front of the headstock, the fingerboard, and the plate on the front are all from one piece of Macassar Ebony and it's cut so that the grain is continuous.
Yes I have a small gearhead mill that I make bridges and tailpieces on. I also use it for cutting truss-rod slots and plaining neck angles, etc.
Basically it's like two basses stuck together, but without the extra top and bottom. So it's standard thickness, 1 1/2, plus about another 1 1/4. So just under 3 inches.
Thanks everyone for your questions and interest.
SoM