I love that purple fabric you are using.
I did very much the same thing. We already had some plywood we recycled from a shelf we took down in the garage, it is a wide piece. We actually used an old wooden ironing board and put the plywood on top so it would be longer than an ironing board without the narrow end. So it is like 18x 50 inches and works wonderful for ironing quilt fabric. Cost very little as we recycled the plywood and the wooden iron board. I added all the batting and cotton for the cover from my stash. I can also fold it up against the wall to get it out of the way when I need too. Love it. After all these years I finally have a large enough board for my cotton.