I’m a long time fan of Star Fleet Battles, which I started playing back in the first release in the early 1980s. I mainly played the Kzinti, but love the Feds, too.
The GC2 ship designer is great fun. I was inspired to create a few ships based (loosely) on SFB. I see you have the Feds ironed out. Here are a few images of the ships I’ve used in ToA.

Fed DW (small hull) – basic defender

Heavy Destroyer (HDD), after Birth of the Federation (small hull) – fast responder

Heavy Cruiser (CA) (medium hull) – front line warship

Heavy Battle Cruiser (BCH) (medium hull) – flagship, best armor, weapons, engines

Dreadnaught (DN) (large hull) – flagship, planetary assault
Cheers!
Hydro
P.S. - I'm using Imageshack and have noticed the text is weak. Any suggestions on making the image clearer?