This is the standard Athearn truck sideframe. I did create a speed recorder from a piece of spruce and added the connection to the cab. I also created the airline for the brake cylinder.
This is the Ngineering LED accessory circuit that provides additional 1K resistors for the headlights and Ditch Lights.
This nice little circuit board just tucks up in the "cheek" of this cab. I still had room to add an interior and crew. The white and blue wires connect to the appropriate connections on the Tsunami decoder board. I run with headlights and ditch lights on all the time, so I did not connect up to all the connections on the board.