The MF is just a glorified Cargo Ship, if we are talking SW, you HAVE to go SSD all the way!
As for the Steam Runner class, they are best used only against fixed targets as LONG DISTANCE ARTILLERY... Whenever I played Armada II you had to have a FLEET of them when you were ready to storm the enemy sectors. you had two fleets actually. the first teh steam runners would creep throughthe map and manuallymake them STOP as a target gets in extreame range. Teh main fleet of attack ships were ordered to protect the SR's while they elimenated the targets. Eventually you reach the main enemy base and send in the attack fleet while letting the SR's hangback and engage targets of opportunity with those cool tri-colbolts...
Unfortunately it will be hard to make somethinglike this happen onthe fly in a FS2 mission without extensive fredding... The Steam Runner is NOT a front line type ship, it is best used as a Support Ship.
Plus the design is not half bad, but Soulwolf (Ent-F) is my all time Fav.. At least until they get an official/unofficial Ent-G chosen and it looks decent. The mainthing about Soulwolf is it make it look like a predator. Something the Federation NEEDS to project finally.