First pictures are of how I built the sand/grit boxes. I build a frame (treated wood, as it sits on ground). Then fill with drain rock. Cover that with a felt like filter cloth. Then build another frame on top. Sand will go in the center one. When including the L shape of the runs, it is 122 feet long. Each run section has been built independently, as a 12'x12' section, yet all connected, for strength. The building, divided in the center so it will hold two species. Each species will have a total of 56 sq. ft. inside their house. They will have 48 sq. ft. under the porch, sand bath area. They'll have a run of 576 sq. ft. on open grass, for a grand total of 680 sq. ft. per species. This aviary covers 1360 sq. ft. of ground. Each side was planted (so far) with Brandon Cedars, Emerald Cedars and a Juniper. Wire that will go on it will be the green PVC coated wire.