Here is something I built a couple weeks ago. It’s just a concept at this stage. There is no microcontroller or motor controller on board. Also there needs to be some additional sensors to do the balancing act. Just wanted to share the images. 8)
I can totally see that working. Toss a gyro on there and you’re good to go. That thing is really cool. You always come up with neatest stuff Jim. 
There is an interesting website by David P. Anderson
geology.smu.edu/~dpa-www/robo/nbot/index.html
on nBot, a Balancing Robot.
I’ve seen balancing robots built by members of our local Home Brew Robotics club as well. Accelerometers required! PID code mandatory. ;>)
Alan KM6VV
It’s like a Segway… not exactly a new idea, but it’s pretty cool.
Won’t getting this to balance be a pretty major issue, given that the majority of the weight will be at the higher COG?
I thought most balancing bots had a low COG.
Actually, it appears to be an advantage to have a high COG on a balancing 'bot.
The longer “lever arm” of the high-placed weight gives more available torque to correct an off-balance. it’s counter intuitive.
I’m curious as to the advantages of having a balancing 'bot, other then just novelty. Possibility the advantage of being able to “put the 'bots weight into it” by leaning when trying to move an external object? Nice not to have to hassle with trailer wheels.
Alan KM6VV
Huh, I’ve seen them with a mast so to speak, but not this much weight. I dunno, maybe it will work. Seems like just getting it to move with the torso holding perfectly still would be a big enough issue, let alone with the arms moving around while its driving.
You baulking at a challenge? He who stuffs an entire PC into the base of the Johnny 5 kit. lol
Not baulking! Just was curious if this can be pulled off with that much top weight 