I was wondering if plexiglass would be a good material to insert into the windows/vents? The windows will be screened in, of course, but for extra cold weather I might want to close up a vent or two and still let the light in. What do you think? I don't know how I'd attach it yet. Oh, one other thing. (Am I starting to sound like Columbo? ) It seems that most people cover their windows/vents with 1/2" hardware cloth? Would it be possible or preferable to use regular window screen? Would that help to keep out flies/other bugs? Thanks!