I just picked up a fiberglass building from work. It is 6' x 6' x 7' tall with a walk though door. I was wanting to put three windows in it and possibly a small window in the door. Does is anyone have any suggestions on what would work from window. I was thinking about finding some use RV camper window and trying them.Just looking for something that would be easy to open and quite. Any suggestions would be greatly appreciated. Thanks