Yes, you sure could do that (as far as making air movement), just depends on the materials you use and your design, right? And, being in SoCal, you don't actually have to make it out of something like plastic or those corrugated sheets, you could use a white shadecloth kind of deal, that would allow plenty of air-flow, too.
As for my bugs, oh yeah, I have got a problem. It's just not a convenient set-up for me, I need more space to at least get around the plants. Ugh.. I won't get into it all right now, but it's been a battle for me to get what I need and get it set up the way I need.