The VX was body on frame, in fact it is the same frame that SWB (2-door) Troopers used.
They only made like 4,000 of them, so yeah not much for aftermarket there. They were never meant to be a mass market vehicle, it was a concept car they went ahead and sold. The body panel stamping molds were...
I used to drive and off road Troopers for about 15 years, I still wheel with friends I made of that crowd including a bunch of VX guys. I probably would have had a VX but for two things: Not enough headroom, and dealing with a way to carry an oversize spare tire. But they are cool.
They actually kind of suck, functionally, I had a helluva time finding wiper blades that worked well on my FJ. Other than that they were fine and I did find the 3-wiper thing amusing.
I've had both, and like both. I moved from the FJ to the GX because I had a hankering for a V8, and wanted more room inside to sleep in for overlanding duty and such. You'll have to decide how much the luxury aspect of the GX means to you, it doesn't really mean much to me (the GX is the first...