Even though I am not a judge in this contest or even a participant, I think the downside of using those pre-made elements is that they are old, poorly built and built by someone else.
I personally think that anyone should be able to use them in any contest seeing as how they come with the program. However, if it is obvious that you used those pre-built track sections, I would only expect a lower score.
Also with Bootcamp, there should really be none of this "but I'm on a Mac and can't use elementary or any other tool" complaints. A 'tooled' track does not mean it will be any better than a handbuilt track either.