SpaceCraft was the culminating 5-week project for an advanced architectural elective that explored spatial computing (including augmented and mixed reality) in design and fabrication. Students utilized Fologram, a third-party extension for Rhinoceros 3D and Grasshopper 3D, along with mobile phones and Hololens headsets to envision and refine a twisting arch design. The spaceframe, made of identical steel connectors and hickory wood struts with unique angles, was assembled with the aid of mixed reality headsets, serving as a holographic template. The design ensured minimal material waste and facilitated flexibility in fabrication while maintaining structural stability. Though undertaken by undergraduate students with limited construction experience, the mixed reality fabrication process proved not only feasible but efficient, taking about 8 hours to assemble. The project illustrates the potential of spatial computing to expand and democratize non-standard construction practices.