Here's an animation of my observatory that I've just made using Google SketchUp.
I'm in the process of making an extension for it and SketchUp is a very quick and easy way to visualise some ideas. New mount don't ya know.
The nice thing about the roof is that you can keep one side virtually shut whilst observing from the other, so in the winter you can keep nice and warm.
The roof is held on by 8 hook and eyelets, but screwed down during very stormy weather!
