Click to enlarge image.
Photo of Webmaster's model in progress.
This vent is pretty much OK. To add a little more realism you can square off the base of the motor unit using the same method as vent 12.
The part also has a stepped curve that needs rounding out. Simply fill the "steps" with putty and sand round.
Note: All instruction step numbers in () denote the instruction step for the rereleased Mincraft model.