I actually have had the idea ( been done numerous times tho by others) about using one of those powerwheels kid's cars and adding a steel chassis, lawnmower motor and lawnmower wheels - im still looking for a cheep escalade powerwheels truck to make one . Some people put subwoofers and stereos in em and use em in sound competitions .
Roof used to make a machine that looked like a mini jeep, but could mow, plow snow, plow the garden- those are rare and hard to find.
I used to be in this one forum, this one guy started to build a smaller jeep totally out of metal, lawntractor motor, bobcat wheels/tires - he ended up selling it before finishing it.
I plan on making a 'rat rod' from a wheelhorse( sheetmetal) and bolens ( chassis)- lowered hot rod tractor- also using a 80's MTD wizard for a 'go kart' - straight axle, 6.5HP horizontal shaft motor , lowered - stuff like that.