Paper Princes you got it ....folds for transport and storage. This will sit on a table to raise the table for cutting. A lot of people find an ordinary table too low for cutting and it plays havoc with the back.
Originally I posted these pictures from my computer not a tablet....so don't know why the double post.
There is not a pattern per se, but I am sure that someone that is handy with wood could easily make this. The top can be any size, but here it accomodates the 16 x 20 cutting mat. with this sitting on the table you can also store things under it. There is a piano hinge for the legs. The bar in the middle was added later, because of problems with the legs collapsing. Works great now.