It would be best to know what kind of joint you plan on using.
But for a modest number of supers with rabbet corners, a pair or three 24 inch wood clamps, a scrap piece of heavy plywood for a table\worksurface and one or two 18.375 (18 3/8 inch) chunks of scrap 4x4 to square up the insides of the box with before final clamping, nailing, gluing, stapling, or screwing down hardware, works well for me. OH I almost forgot, better get a small combo or cabinet square to check or try the inside box corners with before doing something permanent, and better get a cheap dead blow hammer to instruct the boards in which direction you need them to move, in the vertical direction. One more thing, someone on here had the idea of waxing your scrap plywood work surface to a fair-yea-well with old fashion paste wax, so glue spills or over runs don’t glue your supers to the table. A fine idea.
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