I led development of a large-scale illuminated rear interior feature wall for the Cadillac iSpace concept, transforming an ambitious design vision into a manufacturable assembly measuring approximately 2 m × 1.5 m. Working closely with designers, I developed multiple proof-of-concept iterations to refine the aesthetic, construction methodology, and lighting integration strategy. The feature consisted of hundreds of opaque hexagonal elements projecting from a continuous illuminated surface, creating depth and texture across a compound-curved acrylic substrate. Through successive prototypes incorporating 3D-printed components, machined acrylic, machined aluminum, LEDs, and fabricated support structures, I refined the assembly architecture and manufacturing approach. To ensure repeatability and visual consistency, I developed precision interfaces utilizing machined aluminum and acrylic components that accurately located hundreds of individual design elements. I produced the complete CAD package, section views, build documentation, and prototype assemblies that established the manufacturing methodology ultimately adopted by the coachbuilder for the final publicly revealed vehicle.