The model seems to have a couple of holes in it, on my end at least. One can see through at the bottom of the neck's base, on the inner sides of the spiky "tails" in the back, on the top and bottom of the plate that connects the two rear engines as well as in front of the main section as the ship widens behind the neck.
Other than that, this is very nice model. I'd love to see it textured and possibly in game.