Gah! If only I'd have known about this a few weeks ago! What an excellent set up.
I just bought a shed from an online retailer called Cheap Sheds (3.0 x 1.9 x 1.8 at highest, 1.7 at front, skillion roof). My plan was (is actually) just to flip the whole roof back when viewing, I don't really need a roof when viewing as I can put some cloth or laser-lite on where I'm going to be sitting with the computers and stuff.
I'm interested in how to stop moisture coming in under the floor though. How did you do it?