Ray, are you asking about how to pin the corners at an angle with a dovetail shaped insert or to make dovetails for the corners?
Jesse, I believe this article was only available as a Wood Magazine online extra. To make life simple I have converted the online article into a simple PDF file which is easy to view. You can save this to your computer by right clicking the link and selecting Save target as. Please support this magazine and their great articles by subscribing, I do.
Ray, having re-read this I know you were asking about the Router Workshop Miter Gauge System. This system makes it simple to produce dovetail corner braces for tables and benches. Plans for it are not available but you can purchase it from Oak Park by clicking their link on our home page.