I purchased a piece of plywood 2'x4'. Then I had my dh attach the plywood to my ironing board with screws and lock washers. Be careful not to get the screws too long or they will come through. I then covered the board with batting and some silver ironing board fabric, and stapled it to the bottom of the board. It cannot be removed, but for me this is fine.... I don't do much ironing outside of fabric for my quilts.
Not difficult and very reasonable cost wise.