This cantilevered stair for a Nantucket house incorporates a steel frame within a board-formed concrete wall to which the treads were attached with specifically tensioned bolts. The system created a stiff walking surface at the end of the treads to accommodate a glass handrail. As a demonstration to the architect and their client, a portion of the stair system was 3D printed to illustrate the internal structure. Using SolidWorks, I built the components, tested the structure using the FEA analysis, and created the shop drawings.