I have a 1977. I was gonna offer parts to you, but looks like you have it covered. Some of old timers on here may remember my cart. I still have the baby moons, with the Westinghouse underlined W on them.
I'm in the process of building Frankenstein ... Marketeer and Honda Trx300ex2. Hoping to get about 60mph out of it.
I bought RZR seats for mine, too. I stretched the frame 2 feet, so I could put the seats in the floor. Of course, everything is fab.
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By the way, you can run 60v to that motor, actually Nate told me 72v, I never tried it. I had 2 large 12v diesel batteries that I added, in series, after the last solenoid. Just sat em on the back . It would lay rubber on smooth concrete.