this mech was designed to be a zombie. taking into account i do not zombie myself, it may seem badly designed the AC/5 is a throwaway weapon to put some extra damage in, the main weapon is the ERLLas.
Upgrade structure and armor, so you can at least place some armor on that arm, and add ammo If the AC/5 is meant to be destroyed, just don't mount it, save the 8 tons for max engine and missile launchers:
Yeah this seems like a really crap build... I don't have the funds to outfit my Cent this way as I am working towards buying the Thunderbolts, but good lord that Alpha is horrid, the DPS can't be all the great, and you only have three weapons, not to mention you don't take advantage of Endo or Fero... The good thing is that you have a massive engine so good speed, and good heat efficiency at least... but still definitely not what I would play... too many weaknesses and not enough strengths.
