I've thought about it too and I have wanted one for a long time I know that it would be a big help, at least make some things easier, although I know unless I can build one on the cheap I have other needs, those being a press and a surface grinder...and I'm probably gonna need a bigger shop!!
I will keep an eye on this thread, I would bet there is someone on here that has the talent to come up with something that would work very good. I have looked at the Beaumont Horizontal Grinder, if I was gonna buy one, that would be the one I would buy, even though it is pretty expensive, but it is expensive because it's built like a tank, and knowing how well my KMG works, I know that horizontal grinder will work flawlessly!