Plans are available here:
It’s a free download. Just click stahnout button.
Also available in DOW download section (forum/files).
BTW, I’m also trying to assemble a small wood chunker because it’s easier to make and IMO safer. The question is will a 150HP Ford Scorpio rearend be strong enough to survive chunking 4 inch branches?
If someone wants a permanent difflock, just weld the gears in rearend. It’s commonly made in Poland for drifting. Nobody buys new diffs, we just weld them.
p.s. Plans are good, machines made according to them are sold in Poland and Czech. Best material for the knives is a leaf spring steel that you can buy almost everywhere.