The Constitution was 289m long in TOS and 305m long in the movies.<font face="Verdana, Arial" size="2"> That may be true, but 'Massive' in FASA is probably in comparrison to a Constitution class, as the most familiar vessel to the players. So thats massive compared to a 200m (?) long vessel, not a TNG scale of over 500m...</font>
For the Winged Defender, from memory, length was ~150m, width ~320m and height ~95m. Mass ~200,000 mt but see my other post regarding old style masses compared with canon masses.<font face="Verdana, Arial" size="2">Out of interest what were the original size specifications?</font>