its shortness makes it very strong in group fights. I suggest to loose the very left wing part, keep the backwards wing though - and shift the right wing to the rear.
Edit: I don't think that it needs to be symmetrical. It might also be a good idea to replace the main tube next to the cockpit with two separate tubes representing the torp slots. just a thought.
Change the configuration of the Bulldog's engines, and the civ freighter's wings, and I think you're onto something! As basic concepts, I rather like these. I dig the personality the mining ships have...very industrial, no-nonsense. I'm curious to see where the designs end up.