The large project boxes used on the Ghost Trap's pedal 1590A and made by Hammond Manufacturing. The 1590A is the Aluminum Metal box that is shorter and longer then the other which the Foster Coupler goes in. Its dimensions measure: 3.64" X 1.52" X 1.06".
The project boxes used on the Ghost Trap's pedal is the model 1591L made by Hammond Manufacturing. This one is available in either Polystyrene, or ABS Plastic, and is the box which the Relay sits on top of. Its dimensions are: 3.3" X 2.2" X 1.4".