Thanks for the input all!

So, its starting to look like the Feather is the one to have (although the Beetles do look amazing!). I think i'll start picking some bits up in the new year. I'll start by building some kind of test mule, so we can get it all dialed in and the boy can get some practice driving. Then i'll look to move it all over to something more robust!

I think i've got most of it straight in my head, but there's still some things i don't understand (specifically electrical stuff). Can anyone please point me towards some kind of tutorial where i can learn about current draw and battery requirements?

Thanks again!