As a roofing contractor in the Aspen, CO area we have installed literally miles of standing seam roofs, mostly rolled on site with our own fabrication equipment. The following is an article found in Roofing Contractor magazine that discusses the many facets of metal roofing:

http://www.roofingcontractor.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000816051