yeah, I can just imagine:
"That's no space station...that's a friggin HUGE construction hard!"
And though that would be pretty cool to have, I highly doubt that that would be possible at this current time.
As far as the Victory's standing as a capital ship because it's called a 'Star Destoyer', I would probably consider it a heavy escort cruiser. After all, that is what the Acclimator class was to the Venator, and as the Imperator class replaced the Venator class, so did the Victory class replace the Acclimator.
Thus, we are presented with 2 possibilities:
1. Start with post-clone wars, modified Venators and research the Imperator class 1, then 2, and finally unlock the Executor/Eclipse (maybe limit it to only being able to unlock one). The same would go with cruisers, though more would be unlocked at once. issue: the same thing would need to possibly done with fighters and frigates...possibly.
Do away with Venators and Acc.s and simply have the Victory class 1 and 2 take the Acc.s place ( only problem is, I think the Victory's class 1 and 2 actually look different, as the Victory class 2's in Battlefront 2 were the escort ships for the empire in space battles). issue: All that work on the Accs and Venators would thusly be rendered useless.
In both cases, a lot of work would need to be put in, and I'm trying to consider the work load already put on Eville.