Cobra Class Destroyer
Speed: 10
Detection: 15
Armor: 15
Space: 30
Maneuverability: 23
Hull: 30
Turrets: 1
Weapons: Prow 1, Dorsal 1
SP: 35 (This part is probably my biggest guess since the points in BFG seem to scale so sharply, and I didn't think to deeply into it.)
Imperial Firestorm Class Frigate
Speed: 7
Detection: 15
Armor: 18
Space: 38
Maneuverability: 18
Hull: 35
Turret: 2
Weapons: Prow 1, Dorsal 1
SP: 40
Imperial Gothic Class Cruiser
Speed: 5
Detection: 10
Armor: 21
Space: 75
Maneuverability: 5
Hull: 68
Turret: 2
Weapons: Port 1, Starboard 1, Prow 1
SP: 70
I'm working on the rest of the Imperial Fleet currently, but figured I'd toss these up since I tried to work out the stats last night. Yes, I realize there will be some play in the numbers, no I don't claim to have balanced them, I merely started working the numbers, so if you need to know if they're balanced, playtest them and let me know, I can make adjustments to some of my conversion tables.