Congrats on BOTY, well deserved. I have a love of these ol KZ's too. I have two 650 motors, a few frames, wheels, etc.. I'll throw together one day I'm looking forward to your build. Looks like it's in great shape to start with.
There isn't a ton to do, yet.... New seat, new bars, fix up the wiring... then assuming it does run then i'll be happy for now. Then i'll rebuild the carbs, maybe put some slimmer turns on it, rebuild or upgrade front suspension, maybe put a small fairing on the front.
First thing im working on, the controls were shit, paint flaked insides were corroded switchs didn't work. So i took them apart, cleaned up the housings, powder paint, soldered a broken wire on the turn signal board... going to pull the wires through the bars and get them put back together.