Good looking model with lot of technical details. There is many unnecessary geomerty as screws threads, shapes copied inside same object instead of being linked duplicates or modifiers doubling faces invisible to camera. I managed to reduce polycount to 200k quad while maintaining same level of details. Also scale is not uniform, objects are off center, texel density is not uniform and many more little tweaks. In short, good design but lot of technical errors, which render this model useful only for offline rendering.