You do mean canon ships, right? Nothing too extraordinary, like Babylon 5 models or such...
What format are you working on? I find SFC3 wierds out after you put in #48 (or so) playable ship.... maybe just me.
If its SFC2/OP, then the sky's the limit, practically. Keep us posted either way.
Only canon ships I have are ones everyone else has, except for a Romulan V'Vorath, and a Rom Ketchkekan (?) authors unknown, but they fit it rather nicely as a Rom Battlecruiser.