Object: make a fitted screen to go over each rear door like a pillowcase, using ceramic magnets to hold it down tight on the outside. My trial and error approach:
--measure dimensions of the back windows and upper door frame, with a few inches hangover to allow for the hems and for securing with magnets. Take the varying thicknesses of the door into consideration.
--Fold the roughly-cut screening in half and turn up the bottom hems two turns, and either secure by sewing or (I was in a hurry) by using black electrical tape (I don't know whether it helped, but I also applied a warm iron to the completed hem with a piece of paper in between the iron and the tape hoping it would make it a little more permanent--so far so good).Â
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--Make two of these, one for each window, but leave yourself a lot of leeway when you cut the sides.
--First screen, the hardest...In order to get a finished screen to fit tight enough to avoid bug-inviting slack, but not too tightly, put the folded and hemmed material over the door like a pillowcase, and use straight pins to fit it, comfortably, but not tightly. Â
--Then using the pins as a guide, sew the sides and shape the top by basting (big stitches), so it can be redone easily if it needs correcting. (Which it did. I was going to reinforce it with a sewing machine if I could borrow one, but frankly, it has done just fine leaving it with the basting stitches.)
--When it appears to fit, turn it inside out so the seams are now inside it, and try it on the other back door (the doors are mirror images of each other). (It worked!)
--To make the second screen, which needs to be the mirror image of the first one, use the completed screen, with seams turned inside) as the model, and use straight pins to block out the shape onto the folded material.
--Then,including generous seam allowances, rough cut the material. It should already be folded in half at the top and hemmed at the bottom. Â
--Use the basting stitches to sew up the sides and shape the top. Try it out for size on the opposite window.
--I was lucky that this approach yielded another comfortably fitting window screen on the first try (which was good because I was having to sew up the second one in the restroom of a state park campground after dark on a hot, humid night!).
--Use some ceramic magnets (they're strong) along the bottom seam to secure it to the outside of the door body.
--The screens worked very well. Now I just have to figure out an awning for rainy nights!
--You can buy already-made stretchy screens online that fit more or less, but I don't think they catch the tiny noseeums like this screening does. And after having been bitten earlier in the summer by 70 noseeums and suffered through weeks of itching, I thought the finer mesh was worth the trouble. Good luck!
