That is a cool idea and it's nice of you to offer the files up, and even make them.
I am having a ton of fun with my new 3D printer and looking forward to applying it to my car projects, simple and complex. Need to get better with the CAD side. I envision a lot of custom wire and cable holders, brackets, plug wire harnesses, and maybe some components for a custom dash and console. Need to figure out if any of the new filiment materials can take the under hood heat and stand up to fuel. I see lots of opportunities for custom carb spacers with venturi's and other do-dads.