Finding more oddness all the time. I've finally figured out the front-end parts:
CR125R triples, with a longer steer tube pressed in.
And, of course...
R90/6 motor, with 1000cc cylinders
R80GS left-side switchgear
Early R90/6 bike, but wiring harness from later R90/6
Mufflers from an early GXSR.
This is like archaeology...
1974 R90/6 w/1050 kit
'91 Bill Holland Steel w/Dura Ace