The Digital Construction Platform (DCP) is an in-progress research project consisting of a compound robotic arm system. The system comprises a 6-axis KUKA robotic arm attached to the endpoint of a 3-axis Altec hydraulic boom arm, which is mounted on a mobile platform. Akin to the biological model of the human shoulder and hand, this compound system utilizes the large boom arm for gross positioning and the small robotic arm for fine positioning and oscillation correction, respectively. Potential applications include fabrication of non-standard architectural forms, integration of real-time on-site sensing data, improvements in construction efficiency, enhanced resolution, lower error rates, and increased safety.