Update:
All done. For now. There was plenty of room for the electronics on the radio deck, leaving space for a couple future components, to boot. All wires were carefully bundled and everything is disconnectable, though I need to move some of the zip ties around to aid cab removal.
I ended up putting both sets of headlights on one circuit, and I put in dual orange bulbs in each turn signal bezel for a nice even, wide shine. Into each side's turn signal circuit I patched a long extension back to that side's second taillight bulb. Both tail bulbs are red, so you end up with the whole tail being lit all the time, brighter under "braking" or at a stop, and flashing brighter with the turn signals. White reverse lights are back there too. Unfortunately when my battery started to go low I did notice that the two roof rail lights that I put in parallel are indeed dimmer than the others after all, so I'll have to fix that at a later date. Speaking of the roof lights, I ended up just putting a manual switch for them under a rear fender so I can run with them off, but still have the rest of the lights working. Oh, and with the external BEC, the lights work even if the ESC isn't switched on.
I'm happy with how the bed liner turned out. It's built up with alternating coarse layers of flat and semi-gloss enamel, with the final misting in semi-gloss. Gives a believable texture I hope.
I adjusted the control layout so now I have a more traditional lefty-throttle righty-steery setup, with the gear shift on a 3-position switch. Ideally I'd move the left x-axis spring to the y-axis on my transmitter since it's an air controller, but this will do for now. The next project that uses the 8ch setup needs no springs on the left at all, so leaving it alone is a decent compromise.
One beauty shot included!