I've always thought of doing the same thing but never took the plunge. After seeing what you just did with this little shack I think I will take the plunge next time, if for no other reason than to have something to practice my skills on - if it doesn't turn out there's no real loss.
You really did wonderful work on the shack. I especially like the way you integrated into your layout with it being on a hill.
Thanks for sharing!
--Greg