I put 2 folding plastic tables - 4 ft long - on bed risers. Then took a 4 by 8 piece of plywood covered with the thick vinyl that goes under bathroom floors - on top of the two tables. It folds over the plywood and is stapled underneath . I have a waterproof 4 by 8 surface that is higher. The tables are supporting the ends of the plywood. It has been a wonderful felting surface. I can send pics if you are interested.