It's easy enough to make your own tabs...I think Darwin pretty much summed it up. Depending on how strong you need the join determines what thickness of paper you want the tab you cut out to be. Tubes and cones require you roll the tab to conform to the part to be tabbed. "Darwin's box in a box" (or tube within a tube theory), is required many times for strength,... especially when upscaling. I build large aircraft mostly. I've found that internal structure and spars many times can be eliminated entirely using this method and build times are decreased.
Good luck
Art
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