All the information you will need to construct an easy to build, attractive and fully functional Backyard Roll-Off Observatory. 95% of the materials are available from your local building materials retailer. Piers are available from us and Pier Shop Plans are included with the Plans, or you can build your own less expensive pier. Roof roll off tracks are available from your local Overhead Door wholesaler / retailer. Track Specs are Included. You will only have access to the download once and the link expires after 7 days. The file is password protected.