This will have to do for now.
I have filled all the screw holes and internal corners with a builders bog. It has all been sanded back. All the edges and corners have been rounded off to make the fiberglassing easier. I am going back to my original plan to glass it inside and out and then flow coat it black. Even though it raises the cost a bit, I want longevity out of this build. I will be picking up the materials to fiberglass it either this weekend or Monday so that will be the next chapter.