I live in a two-light town, and the local library does custom prints. Six-bits says you've got a friend who has one. If you're on Facebook, ask around.
Flashlight holder I designed:
https://www.thingiverse.com/thing:6718351
Dust seal for bed storage box:
https://www.thingiverse.com/thing:6716430
Oil changing channel:
https://www.thingiverse.com/thing:6742234
ARB compressor bracket for engine mounting:
https://www.thingiverse.com/thing:6721234
I use Sketchup. The learning curve isn't steep on such things as my flashlight holder. You design the profile and then "extrude" it to the length you want. Other stuff... sure, but there are lots of YouTubes.
I must have missed the interview about cup holder space. And yeah, Sheldon talks about the engine and tranny and frame and suspension, etc, in several videos.