It could be done very easily! A LOT of people have done this as well. Especially if you don't want to build the main structure. All you'll have to do is cut out your windows and vents, and you'll be set. Be sure to read up on venting as you'll need plenty. I just bought floor vents at Lowes and am installing them up high in the eaves. Then I have plenty of vents on the other walls too. Check out your Habitat ReStore locally and find a great deal on windows. I bought two windows for $5 a piece! I still need to sand them down and re-paint... but totally worth it! You will also find knobs, doors, hinges, handles... all kinds of things at the ReStore. Some of it is new, just whatever a contractor is getting rid of.
