Making Airline Passenger Doors From Scratch
One of the many features present on an airliner that should be represented in a YSFlight model are the passenger doors. While some older models will use a boxy design, a smoother design with a constant thickness can be developed with a very straight-forward process.
Getting Door Dimensions
One of the most important things you will need for this is the door dimensions. Typically you can find this sort of information in airport planning documents (Boeing aircraft especially) but you many have to do some internet-sleuthing. Look for an overall height and width.