just make him a 2 cubic foot ported box and call it good. This is 2 cuft net, but probably around 1.75cu ft after displacments.
Width:20 inches
Height:14 inches
Depth: 17 inches
Thickness: 0.75" MDF board from home depot
Slot port needs to be 3" wide 12.5 inches tall(accounting for wall wood thickness)and roughly 35-45 inches long for tuning between 34-38 hertz after displacements.