Top Flite had a rubber powered Jig-Time kit called the Arrow-Jet. You could leave out the rubber and prop and install a Jetex 50 on the bottom of the fuse and re balance the plane. I did a couple of these and they flew just great. The Arrow-Jet was a good plane on rubber and really neat on Jetex.
We also built little snow sleds, just piece of 1/16" ply about 3" x 6" with a keel and a 1"sq balsa top for the engine mount and canopy. We mostly used the Jetex 50, but I also did one with the 150 Paaloader. Man on the morning of a fresh snow, we'd get down to the ball field before there were any footprints and let out little sled loose. Fast and Furious!
I built a Peter Pan Jet payload from 1956 FM plans and flew it in the 1957 Willow Grove nats without much luck. In 1957 I scaled it up 150%, used a little GWS 2 1/2" or so electric ducted fan, and added mini RC. It was and still is a sweet little sport job! Dennis will like the VEE tail.