Joyce, I made a similar type of board to yours but made the top portable. I took a piece of 3/4" plywood and covered it in padding and then a flannel covering. I stapled it underneath. I turned the big board upside down on the floor. Then I turned the ironing board upside down on the covered wood and marked 5 places on it -2 along the sides, 2 along the "curve" and one at the end. Then I screwed a 6" piece of 1' x 2" wood at each of these places. These hold the board snugly in place. That way I can remove the big top and put it away if I want to use the ironing board.