For the heat, belly heat is more efficient ,it can be done with back heat as well but it would require that the ambient temp in your room is at leastn 75 degrees or higher.Originally Posted by kplunk
As far as the rack itself you can do a 20 tubs rack by getting a 4X8 Melamine sheet from lowes or home depot (should run around 25-30 dollars).
Your shelf dimension should be 35 x 13.5 allowing you to have 4 rubbermaid shoebox tubs on each shelf