Morning, I am planning on making a larger squared styrofoam incubator 4'x 3' x30" with a lid/window, but want to use hard foam pieces normally used for siding insulation - you know, those 4'x8' sheets of blue or pink foam cut down to the size i want. It will all be wrapped and secured in a heavy cardboard outer layer - just like building a big rectangle-size box with insulation inside. Any words of caution about using this type of foam sheeting? i checked the material's website and other than don't eat the stuff, they had no other warning posted. thanks for any feedback you have.