The thread question is "Do we want one?", and I vote no. The Dogfather is already an excellent chopping tool, to the extent that it can replace (and surpass) a light hatchet. Making it longer and heavier will reduce its excellent all around utility, and turn it into an awkward specialist bar. If you need more chopping power than a DF can provide, you don't want a bigger knife, you want an Estwing or other light-weight axe. If you want to make a decent super long knife, make it thinner as well, and add some weight to the butt so that it doesn't turn into a baseball bat. But now you're making a machete, not a "XXL Dog Father".