Here's a common corner for a sheet metal counter.  There is a .6875 radius along the back bottom edge, and the intersection of the back and side.  The intersection between bottom and side is a tight bend, around .1 or so.  I'm not sure on how to get SW to figure this one out.  The flat pattern is a bit funky in the corner...

I'm getting close, but figure there's probably a better way.  I need to add material in an unfolded state, and if I add it properly it crosses, and fuses, a bend line in the flat.