I've been told by a couple people that V-drive Video has boxes of literature, and might have some information about the Hondo GT deck like mine.
What I'm trying to find out is why it was done and about how many were built (jets vs v-drives)
I can't really answer either of these questions. I could only guess that the GT deck was mostly innovation. It eliminates the windshield and "looks" stronger than the tradition t-decks.
Again only guessing, I bet there were very few made compared to the standard T. In my travels your boat is the only jet I've ever seen ("in person") and I've seen no more than 20 v-drive flatbottoms with the GT deck.
I would try and contact James or Mike Brendell to find out for sure.