A table from one sheet of plywood? Yes it can be done and whenever we camp with other Troops we are routinely asked about our tables among other things.
With some research we have found a few different plans for the tables, two images below which are also presented as links at the bottom with two additional links for PDF files for other drawings.
Note: for the drawing below we do not use the cleats on the underside of the tabletop, nor do we use the hooks. Building them this way allows the tables to breakdown and stack in a much smaller area.