Btw, how was the SZ to drive?
Hands down the best handling car I've ever driven, apart from a Lancia Integrale that had been destroyed and rebuilt with new panels from the floor upwards, but really not very quick at all. I had a couple but they were both very low mileage so perhaps the engines would've loosened up. These days I get the impression that parts are very hard to come by so it would be a bitch to run one.
Quick cars are out of my system now. They're like really shit relationships. A few moments of joy mixed in with long stretches of utter horror when they go wrong.
And because they've been standing still for most of the last 25 years something brittle WILL break. And because, as you said, everyone babied them there was never a market for spares. The upside is that if you just want keep babying it it will probably rise in value.