As Kaine's PA is using old starships and equipment is it possible to cut the ISD2 from its build line. This makes the use of the ISD1 more, because lets face you will hold out for ISD2 for just 400 credits difference. This would give the PA some more identity to the PA without having to add any models/work and would fit in with the history. Or more radical replace ISD1/2 with the Tector as that is a clone wars Era ship, but with the Praetor II, that may not be necessary.
First of all, Tector makes absolutely no sense, because the PA didn't used them. Harrsk was someone whom had Tectors, but Kaine never really used them.
The others. Removing the ISD 2 would create imbalance. In early game, denying them from the PA would be a horrible idea, as the player(or AI) would lose his only access to really heavy units.
Not to mention, Corey stated it hundreds of times, that PA is not a Clone Wars era collection. They use Aclamators and Venators because they were available to Kaine, and he used them. They have the Munificent because that was originally a Banking Clan ship, whom happened to be supporting Kaine.
The Lucrehulk is only buildable in corporate sector, because there they were still in use in relatively large numbers.
Is it possible at ERA5 for PA to be granted the ability to build a single Sovereign-class Dreadnought, as a reward for surviving to ERA5?
Simply wouldn't make any sense. Kaine was never ever associated with one of those. In fact, only Palpatine was. Not to mention Byss was the only known planet where they were ever built.
Another fun thought: could both PA and NR build the ISD2 at Bilbringi.
i already said it about the PA. as for the NR... They never really built ISD2s. They used the ones they captured at Endor and other places too probably, but they never actually mass produced them. Oh, and Kuat would make much more sense, as KDY was the main Star Destroyer producer.