Actually, I have an old tractor standing around I don't use anymore. I had (past tense) given some thought to doing something like this. But after taking into account the engineering to build the equipment needed, expense and safety considerations I decided not to pursue it. What I had in mind was not as large as in that picture. My bowls would have been 'only' about 8' in diameter. Would anyone like to buy a Massey-Harris 44D tractor?