Hmm, ok. But do you have anything that is lighter and more agile to help protect it? If you are going to use it in battle against other mechs, I gantry won't be enough and plus what about air support. Like you said a siege class, but the main question is that can it be used in open combat or defense? If it's offensive and mainly for sieges or even artillery support, it's going to need that.

Plus how good is it used in different terrains, if it is used in a mountain siege or a rocky surface, how is against fast moving units going down and high up bunkers and infantry? Also what about if forests how can it lock on units behind cover and since it is slow moving I'm guessing, it would be an easy target for traps and mines.

So how good is this mech in different battle situations And their location. It all depends on how you use your weapons and troops in Amy given battle situation that can turn the tide of battle.