I wanted a bug screen for the front windows of my mercedes camper van that were not so obvious. These are well hidden behind our Weathertech side window deflectors.  They fold down into thirds when not in use. I used left over nylon screen door repair material for the mesh sandwiched in between the similar parts (there is a groove/recessed area to help offset the extra width of the mesh). I glued the pieces together with super glue and used short cut parts of a wire cloths hanger (2mm diameter) for the pin in the hinges (don't tell my wife that's why her dress was crumbled up in the corner). On the Center piece it's most important to make sure that the inner sides near the mesh line up  as opposed to the outer two pieces where it is more important to line up the out edges. Ignore the ridges/fins on the top side seen in the photos, I found that those just made for a worse fit and thus deleted them.