What is the goal for size? The entire tabletop? When you need the tabletop, how do you want to store the ironing board? I think after you answer these questions, it will probably come to light about how heavy it needs to be.
My husband made mine. We took the legs off a 48" Lifetime table. He made the ironing board to fit the legs. It works terrific! It's very heavy, but I rarely take it down.
Hope this helps!