The first bracket looks to be the top bow pivot that mounts in the indent above the rear wheel opening on the body. The second is just a guess for the moment, but my shot from the hip tells me that it is the shovel handle tie down bracket, that goes under the hood. The other two, I'm going to have to think about, then look through my photos on Monday.

The battery box is fairly complex for no bigger than it is. As long as you applied a good amount of paint, a few pin holes will be alright. I won't tell if you don't.