This is a blog site dealing with the building of a backyard observatory. My son built this one in Coquitlam and he has set this up, written the text, and taken all the pictures. You will be able to see that it is probably not a project for everyone. The whole idea of a backyard observatory is to let you spend more time observing than you do setting up your telescope. The larger the telescope, the more time it takes to set up. My son and I have been amateur astronomers for over thirty years. I would build an observatory like this, but for the fact that my house is surrounded by big trees and the horizon is almost straight up. I either have to sneak out with a chain saw and cut down the neighbor's trees or buy another house in a better location.
http://www3.telus.net/~ekfuller/files/dome_0c.pdf
http://www3.telus.net/~ekfuller/files/dome_0c.pdf