they are early models indeed, used for the pilot and for storyboarding with stills. J. Michael Straczynski worked closely with NewTek while developing the show, and contributed a lot of improvements and suggestions to the first editions of Lightwave (included with the toaster..)

The exterior 3D shots were 100% Amiga generated, at least for the first few seasons. Though they did farm the bulk rendering off to Alphas using ScreamerNet (also a NewTek platforms controlled by Amigas) almost as soon as they became available.

other fun Hollywood tie is that the chief engineer of the toaster was Brad Carvey, the brother of Dana Carvey