To continue Sea Tygers exellent conversion work, here is The El-Dorado class Heavy Frigate from Steves Dominion War supplement.

Origin: United Federation of Planets
Class and Type: El-Dorado Class Heavy Frigate
Year Launched: 2364
Hull Data:
Structure: 40 (Ablative Armour)
Size/Decks: 7/24
Length/Height/Beam: 420/105/257 metres
Complement: 573
Operational Data:
Transporters: 6 Standard 6 Cargo 1
Cargo Units: 70
Shuttlebays: 5 Saucer port, Saucer starboard 10
Shuttlecraft: 35 Size worth
Tractor Beams: 1 FV 1AV 1
Separation System: No
Atmosphere Capable: No
Sensor System: Class 3 D +3/+2/+1/+0/+0 3
Operation Systems: Class 3 D 6
Life Support: Class 4 E 7
Propulsion Data:
Impulse System: Class 6 .9c D 5
Warp System: Class 7.6 7/8/9.6 7
Tactical Data:
Beam Weapons: Type X Phaser Arrays (x3) D 15
Penetration: 5/5/4/0/0
Missile Weapons: Mk V Torpedoes (x3) 15
Penetration: 5/5/5/5/5
Deflector Shields: Class 6 D 14
Protection/Threshold: 17/4
Miscellaneous Data:
Manoeuvre Modifiers: +1 Command/+ 1 Helm/+3 Tactical
Starship Traits: Ablative Armour


Notes:
All El-Dorado class vessels were refitted with ablative armour in 2370.