Heikki,
I thought about using Velcro around the doors but I think it will be a PITA to undo and REALLY require alot of work. I know a 1" (25,4cm) doesn't seem like a lot to undo but think about ripping a whole side/sides and bottom up to get out. Then, when you have to get back in...............
This subject came up a few years ago. Somebody, I think, had an idea about using those magnetic strips to seal the door up to keep the skeeters out............. maybe I saw it at Minden

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I had an idea about using a long zipper and making a zip open screen but never ran with it.
Jeff