Sounds like you are getting some great advice and you are starting off in the correct direction by asking questions. In an effort to help I would like to add that any thing that looks model airplane like will not score well. Example. Exposed control horns if the full size does not have them,also detail items such as door handles that are too large for the door etc is a common mistake.
Your documentation and what you show or don't show is key to your score. Many times competitors get upset when their airplane does not score as well as they think it should and all along it is how they have documented the plane and not the plane itself.
Good luck to you,be prepared to earn and learn your way through. It will be a very rewarding experience.
Mel Santmyers.