The mosquito screens are the only part of our conversion we had made by others. They're hand-made by a nice couple near Montreal. I'm copying this info here in case it could inspire the DIYers in here:
They're completely "hermetic", the rear door fabric is waterproof (we will shower back there) and the magnetic door works really really well. It's truly an outstanding product, but it comes at a truly high price tag... moreover, they're custom made by a small local company north of Montreal and they insist on installing it themselves because the magnetic door is sensitive to installation. So I doubt they ship them, but you could always drop them a line:
http://rolef.ca/ (there is an option for "english" in the menu...)
They are hold by the door seals, velcro and some sheet metal screws where the tension is higher.
No more bugs!
http://faroutride.com/mosquito-screens/
https://www.youtube.com/watch?v=pEMVXuq4Ut4&feature=youtu.be