In 1987, Traxxas released the Cat and Fiero. I have a Fiero in very good condition (no box) and a Cat in new condition with the box. The Cat seemed to be a solid entry into the 1/12th scale carpet racing world (although heavy compared to the RC12 or Bolink counterparts) and the Cat simply seemed to be a backyard basher that was a low-quality Tamiya Grasshopper or Futaba FX10 alternative. Nothing about The Cat seemed to scream quality or performance, but it is nonetheless one of my cherished pieces of Traxxas history.
Fiero / GTP:
As for the GTP/Fiero, I also wonder about kit vs RTR availability. I know it was available as a RTR, but early on in the company's history, Traxxas seemed to offer both options for those who may want to build the kit themselves. If a kit did exist, were there separate part numbers?
Here are some images of the GTP from my collection. A few things about it: I do have the original controller but the receiver has been replaced with a Futaba unit which requires a 4-cell battery pack. Originally, the Traxxas receiver would have been located where the battery pack is now, and nothing would be mounted where the Futaba RX is. I do not have the box for this one and it has some scratches on the bottom of the chassis, but overall it is in fair condition.