The size of the bottom (including the parts under the walls), in feet, is 4 5/6 x 3 2/3 x 1/12.

The size of the two long walls (not including the bottom but including 1 inch at the sides) is 4 5/6 x 4 1/3 x 1/12.

The size of the two short walls (not including the bottom or 1 inch at the sides) is 3 1/2 x 4 1/3 x 1/12.

I multiplied the last two volumes by 2, added the first volume, multiplied by 64 and 7.2 and got 3,453.9.