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I've rebuilt the engine (all new bearings and seals, re-bore and new piston required as the bore was full of water), rebuilt the wheels with new spokes and rims, sourced a new (old stock) tank as the original was like a collander, and had the frame blasted and primed. I need to paint the frame, but as it's supposed to be the same metallic blue as the tank, I'll probably ship that out to get a nice job done.
If anyone knows of a half tidy seat (or just the base) for a B100P or B120, let me know. They just don't seem to exist, so might have to modify one from an A100 to fit.