This absurdvatory is the same exact one that Russell Croman came up with a while back http://www.rc-astro.com/equipment/old_observatory/index.htm It is a simple Arrow Sentry Storage Shed. I had to order mine from Northern Tools http://www.northerntool.com/ I was looking for an easy to setup observatory and decided that Russell had a good idea when he built his. I didn't want to build a roll off roof so this seemed to be the easiest solution. The Arrow Sentry is nice because if you leave out all the screws that hold the roof on, you can lift the roof off with out too much trouble.