There's more than a hint of a Star destroyer about Scorpio as well. I actually really like the ship, after having the most powerful ship in the galaxy it was a nice contrast, though obviously for drama's (and budget's) sake it needed a teleport, and it soon became the fastest clapped out freighter in the galaxy as well! Oh and it had it's own personality ship's computer obviously!
It's interesting to think about where they might have gone, ship wise, if there'd been a fifth series? Something like a Pursuit Ship might have been a decent midway point between Liberator and Scorpio I guess, though you get the impression it'd be a bit cramped. Scorpio wasn't huge but at least you had Xenon base as well.
The logical answer might have been to have them find another ship built by the System, either another DSV or, more likely, some other variant, maybe bigger than the single hulled ships the System had, but smaller than Liberator, given you got the impression they only had two DSVs. Pulling together all the tech for Scorpio was fun but I don't think you could pull that storyline twice.
Finding it would be easy to sort as well. Imply that Avon had had Orac searching for references to System technology/specific energy signatures that matched Liberator's since they acquired Scorpio. Have the survivors speed away from Gauda Prime in a stolen Pursuit Ship at which point Orac, reluctantly of course, reveals that he may have a lead on a ship that potentially originated from The System...
