Uh, if the starforge system went nova, the starforge is royal toast, simply because the thing is ludicrously close to the star. We're not even talking mercury close, we're talking "Why, exactly, isn't that thing melting?" close - the ending of Kotor makes that pretty clear. Blow up one stabilizer and the thing falls into the thing.
On the other hand, maybe that just proves it has some absurd heat shielding, making the explosion null and void.
Crew shouldn't be much of a problem for the forge. While people are a bit beyond it's capacity, the thing spews out droids like there were no tommorow. While they may not be the ideal crew, they're certainly capable enough if you make them right.
And you know, I forgot something - the forge has a rather major defense system with one heck of a range, capable of disabling ships from quite a distance. If that works on the shivans, they're in big trouble.