Here is my old observatory. It is now a storage shed with the dome removed. I built it in 2000 and removed the dome 2009 when I needed to down size. While it was up it housed 1st a LX200 10". Later a LX200GPS 12". It served the purpose admirably with a permantly aligned polar wedge.
Construction details
http://barry.sarcasmogerdes.com/obse...s/Obsvatry.doc