Tom,
I'm down in Clare. That looks a neat bit of home brew there. Hope you don't mind if I borrow your plan. Just got an urge this year to plant a piece of ground which I know was a great spud and vegeatable plot in olden days. However it had become overshadowed by very large ash trees. Having cleared the massive overhanging branches, I am left with big amount of firewood. Your schematic seems a low cost way into a splitter.
BTW, the spuds and veg, are coming on a treat.