Maybe I am thinking about this all wrong, but I priced out materials, from one of the great cottage industries through HF, for a DIY tarp. I would like to have something with more coverage, doors the whole bit. Anyway what I have found is it will cost about he same maybe more to make one as opposed to buying one already made. It did not seem to matter whether I was pricing Sil (the most likely choice because of the $), or cuben. Am I looking at this wrong? Material for Sil was about $110 without shipping.