If all you need is a wall to keep stray light and breezes under control, or away from the eyepiece, how about a pentagon of 2x2s and plywood panels bolted together? Check this out, it might work. It could also have a roof, with as many panels of the roof open as you desire.
http://www.strombergschickens.com/supply_overview.htm OK, I know it's a chicken coop! I saw the idea in a book about home observatories written in the mid-seventies. I ordered a set of their "star plates", and they delivered quickly.
http://www.strombergschickens.com/supply_overview.htm OK, I know it's a chicken coop! I saw the idea in a book about home observatories written in the mid-seventies. I ordered a set of their "star plates", and they delivered quickly.