A bit of an update on this one. It turned out great of course, but I always had the thought of doing something a bit different with the electronics once I got it:
I put an Aguilar OBP-1 in and wired it V/V/T (p/p active/passive). The 4th knob is the bass boost on the OBP-1 and the treble boost as an internal trimpot. That worked out perfectly. I also put in some Frailin split coils which were good, but not quite what I was looking for. After some reading and listening it sounded like the Aguilar pickups might work for me, so I hit up Greg for a set of the 4J-HCs.
That turned out to be exactly the sound I had in my head. Beautiful, classic fretless J-bass but with all the feel, fit and finish of a Roscoe. What more can you ask for? Word is the Aguilar pickups will be come a stock option from Roscoe with an OBP-2 (stacked B/T) and passive tone. IMO that's a very