OK, Mathijs, thanks a lot for the info. So most of these should be stored in that warehouse, probably gathering dust. Would like to have a look inside... Or take away something, even better.
BTW, Woody did use a 2-Humbucker equipped LP Custom back in 1978. Didn't know about the P-90, though:
It's not very clear, but you can see the pickups
[There'll be no wedding today...]