I was thinking about your question. Here are a few thoughts. First, temperatures in PVC tubes can soar to 150 degrees versus 120 degrees in the same conditions in a wooden nursery house. This information was from a study on the uninsulated Maberry PVC tube house. Second, larger diameter PVC pipes with wooden baffles can help to offset temperature swings. The BatCan is 10" diameter x 32" tall. See link below. Note that I have seen 5-gallon and 7-gallon plastic buckets that could be used at a fraction of the cost of the BatCan. The height is below specs though. Maybe two or three of these buckets could be cut and attached to give you the diameter and height that you need. Would be rain proof and wind proof, plus you would get to be as creative with baffles, vents, insulation, air flow, as you want. Stucco, paint, bed liner, and pet mesh could all be adapted.
http://www.batmanagement.com/Ordering/batboxes/batcan/batcan.html