… I might keep the frame until it’s really worth something.
That may be never!
I’m into the retro MTBs a bit, but they have to be quite special to go for big $$$. Like a Klein with a fantastic fade paint, an early fillet brazed (by Tom himself) Ritchey, or a smaller brand with lots of niche parts (like Kooka cranks and brakes, for example.
The mainstream market stuff like your SA just doesn’t seem to appeal to enough people to bring in the big bucks even though it was top of the line when new. However, there’s a good chance that someone will buy it, fix it up, add it to their collection, and ride it a bit.
Retrobike +1.