Here's Gravedigger, as of last night:
Also, I pulled the stock PowerWheels Jeep out of the pile out back. There was no reason to think that it didn't work, just needed new batteries.
I pulled out the old two 6V batteries and replaced them with two 12V batteries.
The Jeep is completely stock, other than now running at 12/24V instead of 6/12V.
Not sure how long the motors and wiring will survive at the higher voltage. Should be good for at least the weekend. I might be able to drive the Jeep at the competition as the pace car!
Also, I built a really stupid hard-hat with a forklift strobe-light on top, running on batteries!