I finally took a good look at the storm windows that we purchased with our 2902ss. The windows (plastic) are attached with screws to the inside of the frame, problem is I have to remove the day/night shades and the valance so that I can install the screws at the top of the window frame. I would not purchase these windows again, too much work and they are very poorly made.
2013 Prime Time 230 FBS
Days camped in 2013: April to November
Days camped in 2014...about 40
Days camped in 2015...more than 2014!!