I know some of the models they had were sold off at the auction in the late 80's (they had 3 or 4 Ultra Twister models there, one of which appeared to be a WORKING model). I believe most of the others are gone since they were big and unwieldy. The only one I know survives is the model of GASM that's out at SFMM in their museum at the top of the Sky Tower.
There were a bunch of really cool renderings, some of which made it into the book. The others may be showing up at some time in the future...
















