The iron hut looks great, I'm still amazed that you are only 15, makes me feel old. Real old.
My only crit would be that you should add some localized wear on the texture. In particular I would add some rust streaks/stains around the diamond shaped panel (especially around the bolts) and around the open area on the roof. And maybe some other details such as scratches or bumps.
For example:
http://images.jupiterimages.com/comm...9/22894910.jpg