I customized a brick to be 6×1 studs and 5 heights to be the same height as Duplo door.
Added a window, chamfers filets e voila.
LEGO DUPLO – Compatible Brick Wall 6x1x5 3D Print Model


I customized a brick to be 6×1 studs and 5 heights to be the same height as Duplo door.
Added a window, chamfers filets e voila.