The basement idea is a good one, but will not work in my case
10-15% was in the range of what I was expecting, someone one my idea thread thought I would get 20-30% which just seamed too high.
Any design guidance? I have to make a window in mine and will likely go the solid over built way. I put up some drawings of a rough shape, do they look right?
I might hit you up for some foam ideas as I want to use that to fill the gap from the structure of tue tail to the shape of my car. More on that when I get there.