Sounds good to me
Tom: I got my screen material at a camping or backpacking/rock climbing supply store. I made screens that go under the front hatch with velcro, and the onto the main hatchway by snapping onto the snaps for the pop-top cover. I put a strip of velcro on the inside of the hatchway across the top. Velcro cannot take being outside, from my experience. I sewed edges around all my screens. They have held up well for 20 years. I am going to try remaking them with a bigger mesh, because my screens are so fine, that they block too much air. There are 2 different sizes of netting an the one that is too small blocks the flow of air. I think your idea is good. If you want to keep it simple, you could just sew a rope, like 3/8 to 1/2 inch in diameter around the edge. When I make mine, I plan on sewing an edge from nylon and adding the snaps to snap on where the pop top cover normally snaps on. We recently discussed this in this fourm. I said that I thought that a screened nylon version made a lot more sense than the vinyl version. I have never seen one advertised, but I would like to. If you make one, let us know how it works. I spend plenty of time thinking about ventilation issues. Aldo