when i redid my sewing cave, dh set up an unfinished door, 30" wide and full length, across a dresser and other assorted cubbies, on top. i covered the door with old wool army blankets, washed and dried several times, wrapped around and stapled. lots of staples. then i covered the whole thing with heavyweight muslin. i can iron large pieces or small. i can put my largest cutting mat on it. i can cover it with all kinds of junk so i can't find anything.
but i wouldn't use muslin again. it stretches as i press with steam. i plan to recover it with....what? anything cotton will have the same result. i don't like those silver-coated fabrics. they don't let the steam through.
i must say, the door takes up nearly the whole cave, but i don't have far to go to use it LOL! and it's worth it's weight in gold.