The door placement is correct for the model of trimotor that I've drawn (5-AT)
It isn't.
Here is a picture of a 5-AT from an different angle
http://www.airliners.net/photo/Ford-5-A ... 4e1fa7f162
Compare the position of the door and the last window in relation to the point where the wing is attached to the main fuselage.
You can see, that half of the last window right to the door is placed below the wing, while on your drawing the last but second is placed halfway below the wing.
In comparison, here is a picture of a 4-AT
http://www.airliners.net/photo/Eastern- ... 4e1fa7f162
with the door halfway below the wing.