Dog, The gap is pretty much "normal" er, common. As mentioned, it can usually be closed up a little better than that, but not by much. On one of mine I put 3/4" stick on foam seal on top of the box when it was going together.
The White fuse holder is "non factory equipment", not sure what someone was doing with that. Also, in the last picture...Where does that wiring go to? I'm guessing it is unplugged in the photo? Lorne