There is one word your going to want to look at (Hydro=water). They will run in grass if its real wet or snow. You might want to look into a hovercraft if your looking for something that will run on water or dry ground.
Yeah a nitro one would be cool! It would just need to be a small mill and a cool runner. Those fans need to run pretty steady, and to lift something heavy, they will have to run fast too. Nitro may or may not be ideal. But hey, take a shot at building one. Ill back ya 100% if you get it production worthy