Matthew Spalding expanded material capabilities within the GT New Horizons ecosystem by integrating deepslate materials into the GT5-Unofficial repository and restructuring Epidote handling to support future content flexibility. He enhanced NewHorizonsCoreMod by introducing new mineral recipes and making deepslate a viable material, aligning processing workflows across core mod and game integration layers. Using Java and Gradle, Matthew managed cross-repository dependencies to ensure compatibility with Galacticraft, thereby broadening material processing options. His work focused on dependency management, game modding, and recipe implementation, delivering review-ready changes that improved gameplay progression and established a robust foundation for ongoing ecosystem development.