To all that are making bigger ironing boards. I use 1/2 in.
plywood and cover it with a layer of foam underlay for rugs.
I then cover it with white canvas. I also use a permanent marker after I have stretched the canvas on and stapled it
so it does not move. I draw my lines on it so I use a
strait edge to get it straight and I press, pin, sew or what
ever needs to be done on it. Works for me.