I am thinking about making a screen door. The obvious options are bifold - right swing - left swing - rollup or what ever else one can dream up. I had thought about velcro as well. So far to bug proof our trailer I have replaced the screens on the windows
added a roof vent with a new screen and rebuilt the original roof vent screen. we like the air changes an open door provides just not the pesky visitors.
I am trying to find out the pro's and con's of the options before I discover them for myself after building all the stuff to make a reliable door. (actually it may be a lot easier not to invent the wheel!)
I am posting this on the Boler
site as well