A few nice cnc engineering solutions images I found:
Blackened steel stair with stainless treads
Image by Caliper Studio
Center stringer convenience stair connects two office floors in Starret Lehigh developing. Stringer and slab edge assemblies are blackened. Twenty 4 stainless steel treads are welded to the stringer type a continuous ribbon. 1 1/four" diameter handrail posts are continuous bent "C" shapes that wrap about treds and are welded to stringer. Stair will be delivered to web site in one particular piece [24′ lengthy 3′ wide 3′ tall @ 2000lbs].
Design and style by Diller Scofidio + Renfro
Detailing, Fabrication and Installation by Caliper Studio. Caliper Studio engaged Eckersley O’Callaghan & partners for engineering services.