Hi,
I uploaded some photo's of my observstory build, just in case you wanted to do one, mine took a couple of months because of a couple of other things I needed to do, like a path etc.
Chris
http://www.flickr.com/photos/13007140@N05/sets/72157603811087661
Thanks Chris, that given me some extra options. Still not sure whether to go for a fixed pier but I think I'll put the concrete and studs in anyway. Where did you get your pier from ?
Robert