I cut the FB blank 4" wide and 5/16" thick. The plan was to do a flat board with no radius, plane the board down to 3/16" except for 1/4" or so at the end, to use as the nut after the zero fret, like so
I actually left it a little thicker than 3/16, but I had a low spot at the end of the board. I assume it was a chip out, but it was a weird strip that was very clean, almost like the router bit dropped lower for a sec, but that's not possible, so it was just a weird chip out on the face. Anyway, I had no choice but to take it down to 3/16 after that.
After seeing how thin it was and then holding it against the neck in the playing position, I think it's too thin.
So, I resaw'd another thin piece of wenge that I'll glue to the bottom, then I'll flip it and plane the bottom down until the board is 1/4" thick. I haven't planed down the section from the pickup to the bridge yet, so I can just plane that down from 5/16 to 1/4.
I'll post pics of what I got going on tomorrow before I glue or hack anything and see if the hive comes up with a better plan of attack.
Also, I was thinking about how much more room there is from the body to the string on a typical bass design. I was wondering if a 3/16-1/4" edge of a FB would cut it. So I looked at other basses like the Marleaux and Ritter and it's the same. Just the thickness of the board and the string just above. Not much room, but I've never seen a comment about it. Maybe it will be fine. If not, I might carve out a small recess/channel in the body, along the top edge of the board for my thumb. Not sure about that yet. I usually put my thumb on the pickup, but that will be the same height above the body as the board. I guess we can wait until it's all together. It will probably be fine.
I stopped at Cabela's on the way home because I needed a duffle bag for carrying crap back/forth to work. While I was there, I grabbed a bottle of Tru-Oil. I don't have any plans for it, but all the cool kids are doing it, so I wanna see what all the hoopla is about.