As to the bomber advantage, can KSP fly anything with flaks? And cruiser missiles are pretty deadly to snubs now because of the speed they can get.
And if it were also opened up to Freelancers, for either side to hire, that would make things really interesting!
Still dreaming of a long version of this where each side had a week or so to take it down/defend. So even if the defenders can't take out the attackers easily, maybe something could be rigged to let them repair the ship, either with supplies, or with repair ships. Repair ships would be amazing!
Since in this case attackers are using gunboats and bombers at worst, if they can't take it down before being driven off, defenders get their chance to regain strength. All we need are the GM's to referee!