Frank if you wasn't so far away I would come and take all that lead off your hands and you could then buy one,,,lol,, Really if you go through and look around in the site there are a ton's of different approaches to ballast boxes. First are your rears filled that makes up a lot of weight. Also if your handy with a welder again you aint got a problem.
And if your like me you can take a small 30 gallon drum punch a hole through it and put the right sized rod that will fit the 3 point lift arms, and a hunk of chain to the top link and then fill that baby with cement.
Cheap easy and really not to hard to get the kids involved all kids love playing in mud. Oh and welcome, and pictures my friend something you come up with could very easily be used by someone else