In my opinion has to be hydraulic too. If he is a agri tech, then surely has access to tractor, or if not a porta pack hydraulic source. Ive helped build/modify one, will be making my own this winter too, and it can be done on the cheap. second hand ram, built vertical using old H beam or heavy channel, and a sturdy base, and jobs a good un. If he wants to sell the stuff, but wont invest say £300 all in, then the jobs not worth doing end of story (if you ask me!).