This stuff was easy to sew. I used a denim needle and easily sewed through layers including Velcro. Kind of a pain working with that long a piece, though, if I did it again I'd do it in two halves and then join them up.
Must be meant to be- we are camped tonight, and through the one single window I put in the top, I can see the full moon rising. I do have to find an easier way to get it to tuck in when the top comes down, though.