If I was converting a bruder I would probably buy one of these kits. Even knowing that I was going to move up to a better piece of equipment someday, I would just plan to sell my converted excavator and recover some of my original investment. I personally dont have any experience with these systems, but I know there are a number of folks on the forums that have had these systems and as far as I can recall they have been relatively happy with them. Obviously it is no premacon or vario setup, but from what I understand they are not junk either.
http://www.magomhrc.com/en/cat-320/2...kit-for-x.html
Its an option worth looking in to.