Bandai in Japan did a styrene Interceptor and I believe a Skydiver. Imai did the Shado Mobile, Sky 1 and a large Moonbase. The Bandai kits were better overall then the Imai ones, which tended to be more toy-like. I think Bandai also did a UFO (very tough to find one)
I have one of the Interceptors and it is a good kit for its size (about 1/72 scale). But it is expensive to find one. The Comet Miniatures based companies in the UK I believe have done a couple Interceptors in different scales with I believe the most recent one being from ENA models. They are expensive, but they are also BIG. Product Enterprise as I recall took the smaller Comet Interceptor and used it as the basis for a diecast model of one, but that was in 2004-05 and they have long been discontinued.