#Suggestions
Alec,
#2. Try selecting just verticies of the door that need to be scaled
(probbably all the verticies except the bottom-most). Select the top
verticies of the door and then do a modify/vertex/2d scale(selected button
on), this will leave the bottom of the door in the same place. (Make sure
that you hit the tab key until you get the exact scaleing you need.)
You can also set the tape to the height that you need (from the bottom of
the door) and scale till it hits the right height.
Hope that helps,
James