Thank you guys.
Krogenar, ideally I would have orthographic blueprints/drawings of a Model M in vector format, which so far I haven't come across. If that's not an option I can model the case from photos. The most important thing to have though would be good reference photos of the keycaps.
For example McWilloughby has access to a tripod and dslr and did an outstanding job in providing me with good photos of OEM MX caps:
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If I had this for Model M caps, it would be enough to get started. Alternately if someone would be willing to mail me a few spare Model M caps I can take the photos myself.
I will send you some BS caps. I think they're all the same profile, so one model would suffice. I'll put in some of the special keys as well -- Enter, Backspace and what have you. As for the case, I will -- hey, how about I just send you one of my Model M's? Would you be willing to ship it back to me when you're done? I feel like BS keyboards get little to no love from groupbuys, etc. -- partly because people want them to remain 'vintage', but maybe a rendering of a potential new keyset would help. Send me a PM with your address, and I'll ship you out a White Label Model M, which I think is pretty common.
Also, in regards to getting SP's color ring to match up with your renders, I would suggest using PMS colors (Pantone Matching System). Kaporkle, does your software environment support PMS colors? If it does, then that might be the best solution. In my work I use Pantone colors for color matching. There are books published by Pantone called swatch books.
They're just little blocks of color that I can use to find the nearest pantone color for anything. If I can get my hands on a SP color ring, I can determine the closest PMS match to each segment of the SP color ring -- IF your design environment allows for Pantone colors. Or, perhaps SP can give us the PMS equivalents on their own?