I have a small coop with walls made of half inch plywood and I have a smallish rectangle that I would like to cover with a piece of plexiglass from the outside. I thought I could either use 3/4" screws with big flat heads, or maybe strips of thin wood screwed around it - and I thought I would sort of glue it with a bead of caulk around the edge (I'm imagining the plexiglass will be bigger than the hole) and then caulk around the edges to keep water out. I could put the plexiglass on the inside but how could I prevent water from seeping in? Could this work? I already have a lot of big hardware-cloth-covered adjustable vents but when they are closed, I would still like a windowed south facing spot. The hole is only 6"x14" or so - but it faces south and a window would be great.