You can get clear plexiglass to fit in place of the smoke color. It does cut down on heat, light, and glare inside with the smoke color sunglasses.
You should have a floor under part of the black tank. The part under the toilet should have a floor, and there is a portion of the black tank that extends slightly below floor level for the dump valve to attach to. The part without the floor should be more on the street side of the tank.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.