Interesting, I never really did think about those structures on Madara's mask are supposed to represent the Kyuubi's tails. Some others have speculated that the design is supposed to correlate with a swirl. We just don't know why yet. It could be that Madara has some sort of connection the former Whirlpool Country (a whirlpool is shaped like a spiral). This would make him even more connected to Naruto since Kushina is from that former country.