I think you have created a monster! :grin:Update: My take on quick Clamp Extender. Uses 1/2" x 2"x 11" stock with one dado and 2 holes to join the bars. The dado is snug to the bar and 3/8" on the jaw side. It works well and could be used to attach multiple bars of the same brand. The pictures show two brands of quick clamps. If I make more, they will be made of 1/2" mdf material (plenty strong).
Charley,I can clamp anything up to about 4' with my Bessey clamps, When I need to go longer I resort to my old pipe clamps and pipe couplings. The longest pipe clamp that I ever assembled was almost 12' long, made up from the pipes of 4 shorter clamps and pipe couplings. I don't have many F clamps, so the pipe clamps come out of retirement for needs like this.