Just finished my latest coop for single pair matings of large fowl orpingtons. I ended up with a grand total of $96 in materials (another $6 for 4 cinder blocks the coop will be elevated on when attached to the run). It's a 3x3 ft coop with 1/2" pressure treated plywood for the floor, walls are 2ft high made of OP Smart siding, with another 1.5 ft of elevation to the centerline of the roof, which is covered with the economy tin. External nesting box, roosting bar on the inside. I may get around to painting it barnyard red later this year, but I need it now, so it's going to be put to use as soon as the cold snap is over.