I did another 24v test with a small fan blowing over the hot area of the inverter, and it seemed to do enough better that I think it will be okay.
I built a bracket out of some U channel I had lying around. It will mount the tower pipe just under the peak of my barn and hold it out so it will clear the overhang.
I also added some heatsinks to the motor just to keep things cool. Yeah, I like heatsinks
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Now I need to make up a base plate for the tower and actually buy the pipe for the tower. I also should move my circuitry from the breadboard over to a circuit board, and mount and wire all my electronics and relays to a panel.