It is a neat design. No turning. Use a round over bit in the router. The mortises are made with a 3/4" bit in a plunge router with the leg gleamed in a jig that allows a 5 degree splay for the legs. The mortise is made as the leg is still square so I can get a good grip then rounded.
I am having to put a few shims some of the mortises to tighten them up.