There are other ways of connecting two objects besides booleaning them (and in my experience, bool union of two just touching objects is touchy at best, impossible at worst in Truespace), but they can be quite tedious. Max has an excellent symmetry function, but I guess that doesn't help you any.
I agree that the turrets aren't the best I've seen, but then they also aren't the cubes of doom from the stock :V: models. Ah well, worth a mention I guess. Also I've got a couple of texture comments, mostly involving the lights. First, that Orion map is icky. I never liked it on the Orion either for that matter, but it completely is out of place on a ship with Deimos/Nike skins. Secondly, the texture you've got as trim on the forward-facing bits, the one with the red lights (is that Shivan? Hades?) is also a little odd; it works ok, but you might try the engine fill texture (not the one with the actual engines on it, but the one with the same background) from the Deimos instead. I fear that glowmapping will bring out the disjoined nature of that texture when you get this in game.
