Thanks for that stuff Peter. Good points to consider. The planing stop does seem like a good thing to get snagged on. I just drew a different workbench plan for a client. It has a twin screw vise on the front left corner. I think if/when I build the NF bench, I might just plan to put in two sets of holes for the pipe clamps at that end and leave them there.
The pipe clamp head I drew was just the one I had on hand. I do like the crank type handles.
Recently I received a clamp with the Multi Angle Work Holder for the Router Boss. The clamp is amazingly secure. I think I would drill dog holes in the top of the bench to fit the post on the clamp. You can see it here in this image.
http://img.photobucket.com/albums/v506/weekender410/DSC05405.jpg