We are building a 3 bedroom, 2 bathroom unit at approximately 1700-1800 square feet including the greenhouse. We purchased our plans from Earthship Biotecture versus doing it ourselves.
Watch this video to see a 3D rendition of the home: http://www.youtube.com/watch?v=N2so9hyNWxc&feature=share
Here's the basic lay-out:
The Earthship home will keep you comfortable in most any climate on the planet. These Earthship plans are the result of 40 years of research and development in the field and on the drawing table. Because these plans are "off-the-rack," this a very "user friendly" approach for the owner/builder. This unit can be the easiest first step into the Earthship method of living. Sizes begin at the 800 square foot "Nest" studio and go up to a 3 bed, 2 bath Earthship and larger. Because every room surrounds you with thermal mass, the rooms provide an embracing thermal stability. Source