We built it in our shop. We modified a design that had been successful in the past. The black tube is filled with lead to counter balance the front assembly. Most of the parts we bought came from ebay, or from the net. The router ebay, same with the cam followers, Thompson bearings etc. We can get very good results on inletting with this machine. I usually leave about .050" on the outside and .005" on inletting depth, .005" to .010" on the sides.
Steve