A friend built one similar to what has been discussed and made the windows out of plexi and they were drop down. The windows are about 12" high by about 3' long on all 4 sides of the shack and he made them by sandwiching plexi cut to size between 2"strapping which ran all around. He placed 2 hinges on the bottom and a thumb toggle at the top in the center. To lower the window he just twists the toggle and the window just opens and hangs down quietly. A bit of oil on the hinges at the beginning of the season keeps them quiet. He had another blind with sliding plexi windows but they were always noisy and harder to keep the place air tight so his heater could work well.