[rc_farmer]

You don't need a couple thousand $$$'s to do this conversion. First you need to disassemble it and figure to see what room you have to work with. If you want to make it full-function, i.e

Movement is easy
independant steering (sabertooth 2x5 rc)

blade function (you have a couple of choices)

drive motors (servocity, robotmarketplace)

this model will require some weight to be added to it also