If you want to build it yourself, I suggest that you look up
Owner-Built House, Cabin and Barn Kits from Shelter-Kit®. My wife and son and I had the cabin up to full weathering in one week, and 6 weekends. Great homes. Ours was a 20 x 24, two floors. 13 years ago it cost $19,000.
They are located in NH and will ship anywhere on the east coast. And I had no large construction experience. Up to that time I'd never even build a deck. If I could do it, anyone could. Of course, now I know how to do lots of things in construction.