I have props that have pretty good morphs from using magnets and other that have multiple parts that can move relative each other in the XY and Z translation --a double hung window for instance. Doing rotations such as a door opening look horrible at intermediate values so you have to do separate morphs for each desired angle. I prefer prop walls with parented doors that can open and close to scenes where everything is a prop including the walls except for the wall that has a door or window and is stored in the character library. But all this is beyond what you were asking about.