Chris, I've built the no weld grinder. Did it as a winter porject about a year ago. I posted a few pictures on Tracy Mickleys website along with my homemade bandsaw. I need to take a few more pictures now that I've had it up and running for a while now.
Don't go cheap on the motor. Keep all of you tolerances as tight and square as possible. I made the main 4 inch box tube out of a thicker wall tube than he suggests. I didn’t want to introduce vibration due to thin stock. I also used a thicker stock to hold the tubes together. It looked like his prototype was weak in this area. I purchased different sheaves than he offers, it gave me more speeds. I think has since expanded his offering of parts this year to include a bigger drive wheel and sheaves with more grooves. I also modified his system of tensioning the belt. I just needed a stronger spring a better way to retain it. He has done the hard part though. Overall the system works good. I do push it hard. I’m glad I invested a little extra in some areas, to keep it reliable when I do crank it up. http://www.mickleyknives.com/html/grinder_builds.html