After I had the time to reconsider my designs and courtesy to some outside advice which can be found here:
http://forum.trek-rpg.net/showthread.php?t=13373
I have made a new version of my Pilum Class system defence fighter; this model has a top speed of Warp 3, instead of only impulse speeds.
The originals design can be found here:
http://forum.trek-rpg.net/showthread.php?t=12318
enjoy!
