Help with selecting engineering resins

I have a few print projects on the go and they all involve applications that I am new to. With the ever expanding range of rigid and tough resins, I am hoping someone with more experience in this area can point me in the right direction. The projects include:

  • Pieces for a motorcycle, not functional, strictly design including badges and emblems that will experience some heat.
  • Door knobs that will experience medium to high usage.
  • Light fixtures that will need to withstand some weight from the fixture.
  • Pieces for the exterior of a sailboat, will not hold weight or be under strain, but will experience the elements.

Any direction would be most appreciated.