The Curtis controller will control the motor with a minimum of external components, but to be safe, it needs to have a main disconnect relay, a pre-charge resistor, fused control circuits, and safer wiring. I made a contour fitting hand control with a switch, for lifting and lowering the EV wheel via a solenoid valve. The photo shows just how few components are needed for the electronics of a simple EV.
I moved the air control stuff to the rear. The exhaust was rerouted to give better clearance under the car. The 5th wheel tucks neatly under there and hardly shows when retracted.