I did my own very similar to wkndwarrior a few years ago, plywood ends with 2x2 frame, took hog wire sheet and formed the round bale, covered that with black tarp and cut windows out of the hog wire. Glued straw onto outside of tarp then wrapped with bale wrap, stuffed straw into bale wrap and walla...made window inserts out of 2x2's and leftover hog wire. Damn hired man almost picked it up when hauling bales it looked so real. Was nice to hunt out of until 60mph winds send it 1/4 mile down the draw and into 100 pieces. Will be making a new one similar to this as the Muddy bale blind is clumsy as F*c% (IMO) and windows are on slides so any wind turns that into a kite as well.