If that's really your entire space fleet, j+b might actually have a chance.
I commented a lot about this on CS, but I'll reiterate it in a nutshell: it seems like it would be better with a more steampunkish feel to it, since it shares a lot of things with steampunk-genre vehicles. I thought about it and came up with a list of things you could do to pull this off:
-- add hand rails around the entire platform. Not necessary in space, technically, but they add to the feel of the ship.
-- Have an auxiliary gunner's seat on the rail gun turret. Even if the turret is controlled by the flight computer, having someone sit in the turret adds detail to it. And if j+b disables the main computer, you'll want to be able to fire the gun as well as steer.
-- build some more controls in the auxiliary cockpit. Make a couple of clips to hold the lead commando's weapons so that he can have his hands free to take control if the pilot dies. That way he LOOKS like he's flying the thing, even when he's not. Right now it looks like it has absolutely no pilot, and that's disconcerting.
-- A couple of fins near the back hull, like the desert skiffs in Star Wars VI. You could call them radiator fins since this is a space-only vehicle.