I've heard good stuff about but never used Antti Lahtinen's spreadsheet for TNE FF&S ship building. The handiest link I have for it is in the TNE Yahoo Group file section:
I've had the TNE CD for about 6 months now, and I just got to reading FF&S1. While it seems well written and rich in options, it was just no fun to use.
Even trying a couple of spreadsheets only made it a little less 'not fun'.
It needs to be reverse engineered back into a CT:High Guard format.
YMMV