Hei Gang,
I made a windshield cover, starting with one commercially made for larger vans. It was a silvery, aluminum-y fabric on top, with some insulation material for $50 or something. I figured it would be perfect for the desert on occasion, and just sitting at home. After resewing the whole damn thing, it lasted all of a year and a half, mostly sitting in my driveway in Oakland CA. The coating flaked off, the backing decayed, just worthless. Pffft! So then, using the first one as a pattern, I made one out of Sunbrella material (found 8 yards of surplus/cosmetic blemished for $120 or so online, $20 or so for the recommended thread and $50+ for the twist locks and oval punch for the fabric washers




), which is the current one I'm using (see pix on vehicle). It covers the windshield and the drivers side window., leaving the passenger door openable without removing the cover. I'm a novice sewing machine operator, and used a regular sewing machine with the thread tension maxed out, and a large leather-type needle (read about on Sunbrella or similar site). I used stainless and brass twist lock fasteners (sailrite.com IIRC) screwed into the body to hold it on securely (I think most magnet approaches are worthless in any real wind, especially with thicker materials--magnetic force falls off very quickly with distance from steel).
I would be happy to send the original decrepit cover (pix laid on mesh table) to anyone who wants to make their own and use this as a starting point or pattern for their own, for the cost of postage (I'd guess $25 or so, but dunno). (I added some material around the mirror notch on my second version.) You might even disassemble and re-use the stainless washer assemblies, and save a few bucks, but pro'ly not worth the trouble. Plus I failed to use the nylon (?) washers under the top pieces on my first iteration, so eventually strong winds might have cut the material due to the sheet metal edge on the top pieces, so you should probably get those in any case. I strongly suggest that one use the Sunbrella material or equivalent, which is guaranteed for 10 years IIRC; anything else is likely to fall apart quickly.
Cheers!

 

i wouldn't want to drill holes in my van,maybe design it so the doors hold it on.

 

This. Because you are camping, not just storing.
Otherwise, there are full-vehicle tented solutions available at $$.
(A common problem, I have to de-tent my car just to fetch my sunglasses).

Obviously, you have skills and are thinking. And have extra time.

 

Great job. Sewing and fabric work is a skill I wish I had.

For those complaining about hardware, a row of self curling plastic straps like in a slap koozie (or just several slap koozies themselves, lol) could be sewn to it and use to grab around the door frames the need to have fasteners. Magnets could be sewn in for the top of the windshield frame and the A-pillar below the door and some carefully chosen plastic hooks could likely fit between the cowl and hood.