The black patches are reflections from low quality rendering. This wont appear in the actual numpad.
The keyboard has a bit of a chunky design, partly because I like it that way, but also to accommodate a second pcb with an industrial grade type-C port for better reliability. The port is decently big.
Regarding colors, a company I've previously worked with only offers two: a matt silver and a dark coal black, both are anodized. I like them since the stuff they did previously was really top quality, sadly they still don't offer other colors.
Thanks for giving me some feedback on the design and renders.