I bought a kit that calls for 1" and 1.5" mdf, but I went to Home Depot and Menards, and they only carry 1/2 and 3/4. Does MDF come in 1 and 1.5"? Also can I just double up the 1/2 and 3/4 to get the 1 and 1.5? I'm a little bit concerned about the gap since that's apparantly the arguement against using a plywood. Anyone know for sure?