Greetings sir. Honestly they can fit any scale. We chose 1:4800 because Classic Starfire ships are enormous. For example, a shuttle is about the size of a modern wet navy frigate.
The important detail about the miniature(s) is that we've designed their physical size to range from about 1/2" (the smallest ships) to 3.5-4" (for the largest ships). As long as that is about the size of the rest of your miniatures, these designs can be practically anything you want them to be. Most of the players who buy our models use them for several different games in addition to Starfire.
I hope that helps.