This video was filmed in December 2014, recording the process of building the structure of the Hillcrest stair tower.  We used HSS 10 x 4 x 3/8" for the structure,  10 x 8 x 1/2" plate for the mounting assemblies, and 1/4" folded stainless steel for the stair treads.  Additionally, all welds on the upper stringer assembly and catwalk were seal-welded to prevent water penetration into the building.  The fabrication time was five weeks (for two women).  The four assemblies totaling 8,500 lbs were craned into place on Jan 15, 2015.