Last item in this row are the awesome speed nuts perfect for my preceding post on corner brackets used for box, case or framing work. Epoxied into a shop made wooden knob they can be the best of both worlds...quick and easy on your hands. I'll post a knob design next.
Solid and versatile this corner clamp idea is great! I still think using tie down ratchet bands would be quicker than the all thread. Another option might be Lee Valley's speed nuts instead of the knobs.