Lost about 5 pounds today, taking out some of the middle frame struts, and condensing some of the wiring down. Also got a LOT more room in the central frame area. Not yet road tested like this; might need changes.
Managed to get rear brakes installed, though, while I had it apart. Nice to have them in addition to front brakes!
Still in progress, gotta swap out the really heavy shock fork for an old 10-speed aero fork. Which interestingly enough is still the same distance from the bottom of the headtube/crown to the dropouts as the 24" shock fork, even though it is from a 700C bike). Guess there is a lot of movement room in that shock fork. But first, I have to weld a tab across the fork to mount the brakes on, and temporarily use just some caliper brakes, until I decide if I'm going to keep using this fork, at which point I'll put some studs for linear pull brakes on there. It should save several pounds minimum without that shock fork.
See if I can move batteries to central frame instead of side trays, perhaps eliminiate side trays and save a pound or so (possibly cancelled out by whatever is used to hold batteries in central frame).