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I think the joystick should be saved for the lazer death ray you plan to mount to the roof. Or perhaps use it to control the lambo-gullwing doors.
Seems like in some of the electro conversion threads make too big of a deal out of making a pot box. I'd run a bicycle cable to the pedal and anchor the housing on one side of a c-shaped piece of aluminum flatbar. Put the pot in the middle of the flatbar, and put a thread bobbin on the spool and cut a small groove in it. Run the cable to the other side of the bar, but use a spring over there instead. Bam, spring return potbox. Simply adjust the attachment point of the bicycle cable to the pedal in order to adjust the stroke.
Materials - 12" of flatbar, trimpot, thread spool, old bike brake cable (I'm a cyclist, have plenty of good ones) and a spring. Under the hood, a piece of wire, all done.
Those microswitches are used to throw the contactors on the forklift. Forward and reverse polarity, plus perhaps a full-throttle contactor that bypasses the motor controller.
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