Thanks for the replies.
The string spacing issue was one of the reasons that I ripped the Schaller Roller bridge off an SX Jazz bass that I don't like very much.
The Schaller also has a shim plate and together they add substantial weight over the bent bridge I was going to use.
Before I cut the nut & nut-slot, I'm going to see if I can find a decent string balance between the two pickups. I flipped over and lined up the pickup covers of the two pickups and they're close enough that I think the rollers should be able to compensate.
All that being said, this thing might still sound like hell when I'm done.
I like the Allen key solution. Great stuff.
Very nice project, for sure for this money.
One thing: I really think you will be having a problem with the output/stringbalance. The bucker at the bridge isn't that well suited for this kind of stringspacing (unless this bridge can be adjusted for smaller spacing). I've done a "JazzBird" in the past with a mudbucker on the position of the neck-Jazzpup, and with that project I noticed that the E and G string had far less output.
I found a way to fix this for the biggest part, the trick is to extend the magnetic field. This was later called by Rob (Basvarken) as the "Nail-That-Tone" method