Being in research mode I'm reading the manual repeatedly and making notes on parts that.... maybe dont have the nicest execution for modification if I'm being nice. I draw in CAD all day and have a small 3D printer farm in the basement: Huff & Dobeck for FDM and Derek SLA, and I have a 3d scanner so I can pull some good reference data.
So I'm thinking about parts that I could possibly replaced with something nicer and purpose built from fdm material like ASA or Nylon. ASA is UV resistant, high impact, tough, and good to about 194 F ( proximity to exhaust and engine applications will be on a case by case basis ). First one that comes to mind it the Coyote throttle pedal, I was not a fan of that procedure . Possibly a slip over the original nub or clamshell design to place the pedal in a better position. Then there was cosmetic stuff like modular gauge bezels and cubbies.

What other things do y'all think would be worth making after your experiences with your builds?