As far as I know, Attack Wing at least seems to have no specific scale to the ships. I might be wrong here, since I don't play the game, but judging from the Starter Set, where a Romulan D'Deridex has the same size than the Galaxy Class, although it should be at least twice as big, scale seems to be of no real importance. The printed mini is about 6 cm long. I can only advice you to compare that to your Attack Wing ships and decide for yourself whether 1/5000 is a useful scale for you or not. My guess would be that the mini IS compatible with Attack Wing. You'd have to mount it on an appropriate base, though.