The level of detail on this is quite impressive. If this was intended for the FS universe, I would question the use of the stub wings, but as this is your own thing, that's a moot point. I do however fail to see the need for the large prow. Scratch that... I just saw in your succession of images, that the prow splits into 2 pieces and slides back to reveal the apparent main gun. That said, it looks too prominent to me and the FS engine doesn't handle submodel translation very well. I would instead have doors with rotate out of the way. Perhaps have 2 upper and 2 lower doors running the length of the weapon, which slide within a larger fixed structure on either side of the weapon, while a pair of semi-conical doors covering the emitter, rotate to each side, also sliding within the side structures.
As for the belly, you may want to do the opposite of the wide "spine" down the center of the top, and do a similarly-shaped trough down the center of the ventral.