Generate a low- to mid-poly 3D model of a land-based drilling rig for Unity: sturdy steel base platform with four stabilizing outriggers, central derrick tower with cross-bracing, rotating top drive assembly, drill pipe stack, mud pumps, and control cabin. Include visible hydraulic cylinders at jacking points and rigging lines. Use PBR materials: weathered metal (gray with rust spots), black rubber hoses, and yellow safety accents. Provide clean UV unwrapping with separate material slots for Base, Derrick, Machinery, Hoses, and Cabin. Export as a Unity-compatible FBX with pivot at the base center, triangulated meshes, and include Albedo, Metallic, Roughness, and Normal textures.