so i just bought all the materials i need to build the enclosure... the dimensions are 49x24x24 with a fold down front door. now my question is what do i do for heating? i have a uth. do i line the bottom with foil and then the uth on top? and then what goes on top of the uth? ceramic tile? i checked out tile and it looks thick.. i question whether the heat will make it through :-/ anyways... need advice.. thanx