eden project
http://www.apricus.com/html/solar_collector_heat_pipe.htm
http://www.dynatron-corp.com/products/heatpipe/heatpipe.asp
http://www.easyfit.com/maincatalog.html
http://www.basestructures.com/services.php?servname=Installation
http://www.arch.mcgill.ca/prof/sijpkes/arch374/winter2002/psyisun/tensilematerials.htm