Now you're talking!!!
UFO the best thing next to classic Trek.
Models:
Interceptor: was made by Bandai OOP, different GK kit can be had.
SID: was put out in small scale resin/white metal (companies escape me at the moment)
UFO: was put out by SHED models OOP I think and limited release by Bandai a looong time ago. The kit is woefully inaccurate though and is vacform and white metal. I did scratchbuild from the Phil Rae blueprints that blow it away. I was supposed to put it out as a kit but never go round to it. I'll post a pic of it if interested.
Lunar Module: put out by Lark, Wave, and Reshape.
Lunar module w/ carrier: Lark models
Moonbase: was originally put out by Bandai when they released the styrene UFO kit. Imai rereleased it in a toyish for kit just before they went OOB.
Shado Mobile: Bandai original, Imai reissue, OOP
Plug: I have a conversion set coming out for this kit to make the Command Mobile (resin, phtoetch, and decals)
Sky 1: various scales/sources, original Bandai, reissue Imai OOP
Skydiver: Not sure of the original but it was put out by Wave and Reshape
I know of no other kits ever made (unfortunately) of the other cool stuff lke Segull X-Ray, Shadair SST, etc. If any does know.....let me know will ya :)
Rob