I have been building and fabricating a concrete batch plant for over 7 years now, been installing a ton of waterpumps, 460v three phase stuff, there is some interesting couplings that are small like 1/4" or so in the Graingers catalogue, mostly I have been setting up the standard lovejoys of motors up to 40hp, myself I was interested in the idea because of it being something different, some planes like for instance the P-51 scream for inlines, if I had a goal it would be to recreate a Merlin V-12 for a 30% plane, or just to have a scale running benchtop model, 4cycle and all.

I remember still that unique RollsRoyce Merlin sound from the Reno Air Races, did you know about the Pond Racer back in '94? A modern day approach to a P-38, very new then.
I was there went it failed in flight, watched it go down , sadly the pilot died.