Michael,
The series website is
http://www.orwell-supersportscup.com
but only has 2002-03 results. The T292s in those years are chassis I've seen a few years ago, and so they're not the item in question. (And we don't know how long the car has been at Rosso Bianco)
I'm not sure about previous series, but Roman Krejci's site at
http://isr.cudlici.com/ has some results (Balton's T282 gets a few mentions), but not complete.
Unfortunately, as we've seen, contemporary reports don't give much on the Schulthess car's history, although I've only ised Autosport, have got MN reports for that period.
Well, I'd love to go to Rosso Bianco too, but my circumstances will need to change somewhat.