No, as it is a pretty large part of the challenge. Though feel free to try, and it will be included in the mod leader board.
If you want your craft added to the leader board you need to fulfill the requirements set in the rules. And avoid part clipping (fairing clipping engines).
Though I am seriously impressed by the speed you accomplished.
He accomplishes the speed by clipping several nosecones into each other to reduce drag and provide a powerful heat shield, also the sepatrons are clipped into the body to reduce drag.
A seriously impressive feat, but still not meeting the challenge requirements.