Legality of CADing components before build season?

Technically, as long as it's only a CAD file, and you're not fabricating or building the actual part CADded, I see no problem with this. Look at all of the drive trains that people have CADded and put on Chief Delphi. Those are done before kickoff, but they're still legal to use during the build season. It's like an idea. They can't say "no thinking about ideas for next year's game before kickoff".