OK, Mica, Susan, Val or whoever at the factory who sees this message: can this be done?
Actually I'd change my idea to the following:
1) Series pickups and hum pickup
2) Humcanceller and preamp electronics only
3) No controls
4) side mounted 5 pin jack (I thought I saw a bass with that here)
5) Essence, or perhaps Balance-K body size/shape.
6) No batteries - power from DS-5
7) Ebony neck laminates

Elan headstock
So that's the idea. Beyond that, I am thinking only of an otherwise stock Essence with the usual choices for woods and laminates.
The BIG BIG question here, is if Ron Wickersham would be willing to do this. I am guessing that the current Series electronics are all on one circuit board, and not separated with preamp and filters on separate ones. But my idea involves having the Series hum cancelling circuitry and just the preamp, feeding out to the 5 pin cable which also supplies the only power, and thence into the DS-5 and SF-2 for tone shaping.
If the board would fit into an Essence body, great. Otherwise Balance-K, I guess. Not having any controls does give some room.
Price wise I would guess these custom electronics would fall at somewhere less than full blown Series I. If the price would be 75% or more of that, I might as well junk this idea and go with an actual Series design.
But my intent here is to make a light(er) weight bass which still has the wonderful hum cancelling and single coil pickups of a Series, and I wouldn't mind having to use the 5 pin cable full time.
If Ron says no, then I think I might modify my pipe dream quite a bit, and do a balance-K with FatBoys to get close to Series pickup sound in a small body.
Like it says...Dreaming...for now!
But if someone at the factory tells me this is possible, I would love to start this custom!
EffClef