There are many different types of Earthship Construction
The Earth ship Biotecture Crew have laid out these options below and I will be posting my drawing in Jan 2013
The Global Model Earthship is the best current design for North America.
The Volted Gobal has a concrete roof structure as apposed to a metal roof and more theremal mass on the interior walls.
If you are on a small budget then the Simple Survival Pod is your choice!