Company Reference:
The CS3 features an improved design that expedites construction for new houses and attaching to existing structures. The engineered steel frame is designed for maximum equipment load.
Image:

The CS3 features an improved design that expedites construction for new houses and attaching to existing structures. The engineered steel frame is designed for maximum equipment load.
Links:
[1] http://www.gpnmag.com/category/topical/structures-related-equipment
[2] http://www.gpnmag.com/stuppy-greenhouse-manufacturing
[3] http://www.gpnmag.com/sites/default/files/Screen%20Shot%202012-02-22%20at%2010.54.18%20AM.png