Some great ideas, thanks. Texas_Ranger, casements are an intriguing idea, never thought about that. The only problem is I need to be able to open them from the inside and not sure how that would work with screens attached. I guess I could make the windows with a removable lower screen inside instead of a removable lower glass panel. Hummmm.
ChrisF, that's exactly what I was thinking of, just not sure of the details. Don't happen to have a picture showing how you did it do you? I was worried about getting enough "frame" around the removable glass panel so it would be rigid enough. Thanks.
Sombreuil_Mongrel, yes I am well aware of the reputation of home center wood and plywood products being a member of several woodworking forums. I probably won't use as exotic wood as mahogany or Spanish Cedar, but will use a good quality straight grain, kiln dried hardwood or cypress. Also, thanks for the link to those turnbuckles.
All the windows are fairly large. About 5 1/2 feet tall by 4 feet wide, typical 8 lite over 1. All quite well painted shut, but that's another issue.