+1 on the supraboats forum. Lots more specific info there.
Basically all the boats of that era from Supra were based on the same hull. Up until 1992 they use a fiberglass hull and wooden stringers. From 1992 on they were all composite.
I would ask biggsie and check his thread out. He has a copy of it here, but more in depth on the Supra forum as well
http://www.wakeworld.com/forum/showthread.php?t=800554
He did a complete restore/mod on an older Supra not very different from yours. You could learn a lot from the thread on steps he took and I'm sure he'd be happy to answer any questions.