I have everything installed and I am ready to test this thing out! No, the car's not done, but I have enough strapped down and plugged in to try a 60 volt test again! I have to wait until someone else is home for safety reasons, but I went over the wiring about 20 times, tested the low voltage setup, got the Kelly Controller programmed and I am topping off the batteries before the first run.
This is the Kelly Controls KHD09401 almost installed and on a scrap piece of aluminum. It's not the best solution, but should suffice for a trip down the street. I am going to get a proper heatsink before I attempt any real road rage.
And this picture is of the batteries and their top off charge before the run. I measured all the voltages and they were pretty close except for battery #2, and it was 0.7 volts lower than the rest. The other batteries finished their top off charge in 30 minutes, but this battery is still going and it's almost been an hour and the charger says its 25% complete. So this battery is either my weakest link, or it hasn't been charged, and I actually don't remember actually fully charging this one battery EVER. It's only a month old, and has an August date on it.