bonner you thief!
I didn't buy welders so I could make pretty metal sculptures. I've made tons of stuff over the years based on something I saw on the internet.. never felt bad about it either.
I'm sure the fit and finish on the stein model is much better than anything that would come out of my garage. Things like axle placement and tongue height have been no doubt dialed in to make that one the bentley of carts. Someone should buy that one if they want the best. Otherwise I think it's sweet that people would learn to weld and try making one on their own. Who knows what good could come out of it... maybe some innovations that could be applied to the next gen stein one. A lot of innovation happens by accident.
I'll probably build a light duty one myself. Maybe right after I build the log arch I've been saying I'd get started on about a year ago...