Some ideas for you

[Bob Oswin]

http://mywoodadventures.blogspot.ca/

[Andrew Hughes]

Nice miter clamps Bob,I was lucky to find a vintage set from sears.That have square corners and long threaded rods.Thanks for sharing your design.

[Sam Murdoch]

Very clever Bob. A great concept and wonderful craftsmanship.

[Sam Layton]

Bob,

Great job on the miter clamp. It looks like it will do a very good job of clamping things up. I also like the way it folds up for storage.

Sam