Excsuse me in advance for voicing my opinion, but here it is. Build what you build, and keep your mouth shut. Even if you personally talk to the national competition director and he assures you that what you are doing is legal, you still might be swinging in the wind later. (Get it in writing, with a signature...) By no means should you share your plans with the competition, because the minute that you outride them, they will protest your butt and try to take what you have earned.
Do YOU think that you're in compliance? Only you need to sleep with yourself. Don't share your secrets with anyone. If they want to know what you've got, let them pay to tear you down!