I'm not assuming as much about what the OP means, Marc. Have you ever designed a door? I have, a couple of times. If he is asking about "design" as he says, there are many aspects and this wouldn't be the most likely newsgroup:
Visual aspects. Finishes. Mechanical clearances. Joinery. Materials. Hardware. Weatherproofing, etc.
If it's really a drafting question, like , "How do I draw standard doors in a plan?" then your answer is spot on. If it's "I really like design, and I want to design a door using AutoCAD." it's not. Who knows?