Kit: MX648F hard-wired with SugarCube7
Carefully remove the plastic coal detailing and area.
Remove the 6pin DCC socket and strip the tender base down. Hard-wire in the MX648 and position flat along the floor.
Put the tender body back on, ensuring that the decoder is low down.
Speaker on top, insulated of course, and a new stage created to place a custom coal load.
Photos courtesy of Mick Storey