Tents for the Future

I found this inspiring- http://www.redskyshelters.com/howtensile4.html
One tensile roof structure designed by Berger covers 2.5 acres at the Talisman Centre for Sport and Wellness in Calgary, Alberta: http://www.aaa.ab.ca/pages/public/csaa/csaa-23.htm
You can see the inside of the structure (apparently at night) at http://www.talismancentre.com/photos2.htm

To me, the most interesting thing about this fabric structure is this part:
"The average insulative value of the roof assembly is R12 and achieves a minimum translucency of 4%, which eliminates the need for artificial lighting during daylight hours."

I wonder what the per square foot cost of the material is.
http://www.geigerengineers.com/project.cfm?projcatID=2&projectID=124

I contacted Red Sky Shelters and received a reply indicating that they would be willing to sell their silicone-coated fabric in bulk quantities to those interested in developing their own designs.
I guess I should point out that Red Sky and Berger are not affiliated, and the fabric used in the Talisman Centre is unfortunately not available from Red Sky Shelters.