I would recommend spending that hour cleaning off the last dirt. Some weathering is fine, but "sand/dirt" isn't really the kind of weathering I have in mind if there is any.
Another thing I suggest working on, since you seam to regret cutting the cod is to try to shim it back together with a strip of plastic to regain the rigid look and feel. You don't necessarily have to fill the join from the front, but I recommend putting it back into 1 piece.
I'm also not too sure about the pop rivets on the butt plate. I can see there are snaps on the inside, but those snaps are supposed to go through the plate rather than be riveted to the inside. Another coat of black on the blaster would also improve the overall look greatly.
To sum it up, neither of these, apart from the butt plate snaps are really show stoppers in my mind, but it would improve your look quite a lot I believe, and definitely make me more comfortable about putting my stamp of approval on this, After all, we do try to look our absolute best as centurions.