I have one of those DH's! After 25 years now, he has decided that it's better to do it MY way and save the grief.
Seriously - go to Home Depot or Lowes and they will cut the board for you - to your specs! I brought my board home, got my (yes, MY) cordless scew driver out and went to town making the frame work. Covered it with batting and popped it on top of my regular ironing board and LOVE IT. Never take it off, except to iron shirts when absolutely beyond necessary.