I don’t think there is a plan to model the Retribution. Like the Vanduul ships it is an empty husk. That’s why they have self-destruct—players cannot board and take Vanduul ships because they’re hollow.
As to the Tally, I think CIG made the same mistakes as those who designed the B-29. They thought guns sticking out everywhere would keep it safe and they simply did not. The Superfortress actually got more funding than the Manhattan Project, and it’s remote turrets we’re a wonder, but they didn’t much hit their targets, same as the manned turrets and the bombs dropped from way on high.
IMHO, the guns are not enough to make it dangerous. CIG thought they would be enough and they were wrong.
However, I still think the beds in the Tally are perfect to sleep half dozen Arrow pilots, and the ship is cheap for what you get. Some have argued it is not a stealth ship, but it has 0/0/0 armor so it is in some sense stealthable. Certainly, it can get in range of its primary weapons without being sensed, given the extreme range of this weapons. So yeah, consider the Tally partnered with a wing of fighters and it makes a lot more sense.