I'm really pleased with my latest hexayurt as a semi-permanent structure. I'll post more details later, but wanted to get the pics up before I lose them. Walls are 5' 4" tall - two 4x8 sheets cut in thirds lengthwise. Insulation on outside was purchased from http://www.insulation4less.com/ Single pane windows from Lowes were around $26.
After all panels were built, we put it together with two people in a couple of hours.