Before I could start the walls I need to get the rear windows in. The kids would have been clostrophobic if I didn't get some light back there. It took a few hours, but they turned out pretty good. I purchased these from Hehr windows and they where about $250 for both. These are 18" x 18" and I wish I would have just went with solid glass instead of a slider. Their site is --> http://www.buccaneermfg.com/