Do you remember the episode where one of the smaller probe ships turned up?
(it looked like the central portion of liberator).


The other ship they used was Scorpio (the computer on board was Slave) - they fitted a super drive and activated it frying the designer in the process.


The main difference between B7 and Star-Trek was that B7 was failed anti-heroes fighting a loosing battle against superior forces in an 'aquired' ship.