I don't mean to sound rude or anything, perhaps I am just a bit nieve when it comes to convertable's, but do they really differ enough to warrant a dedicated forum section?
Apart from the lid, what's the difference, many other celica's have leather interiors. Essentially, the vert is a GT, and apart from the back lights, they are very much the same. It's understandable with the GT4's as they have a turbo, different engine parts, drive train, 4x4, body work, costings and lots of other subjects.
Just my 2pc.