The majority's irrelevant. If they stick to that, they'll lose to people willing to make 2 PPC hunchbacks.
Hell, as much as I'd like a game with more restrictions to make each mech unique, I'm not going to cripple myself. I'd use a 2xPPC hunchback if it works. Given that arms track faster than torso weapons, I'm suspecting that the 2xPPC HBK will be especially effective as an economy CPLT-K2. The HBK might even have more frontal armor.