I have a chassis that is missing a transistor on the neckboard, but is otherwise complete. It had a catastrophic failure where it burned up some parts on the main chassis and the neckboard. I replaced all the parts on the main chassis, and replaced the parts on the neckboard - and had to do some jumpering and surgery to fix burnt traces and such so it looks ugly. It powered up without burning anything up, but I then found that the tube had been broken underneath the yoke (first time I've seen that) so it was no use to me after that.
The chassis may work just fine after that neckboard transistor is replaced, or it might work fine if you swap another neckboard onto it (which should be fairly easy). Or it might not work at all. I really don't have a way to test it anymore. I offered it up for $20 + shipping a while back if anyone wanted it for parts or a possible replacement (as it may be fixed), but got no takers. Still have it...