http://www.loveforlife.com.au/node/5917
This site has heaps of different styles of hobbit / earth homes. Some are made from recycled goods and minimum funds. Straw, timber, mud, tree houses, designs and pictures. Hope this helps.
Are you guys concerned about latitude for a building site? We have an ideal spot picked except I don't think it is high enough above sea level, 150 meters high and inland about 50 kilometers? Just thought I'd put it out there if it is an issue? Cheers Pep