By extrapolating backwards and counting it out, we will find that this Giant Zaku has a total height of twenty-six metres! A truly unprecedented size for a One Year War MS!
Those giant arms and legs that appeared on later mobile armors?
They are either optional add-ons for the Giant Zaku, or stuff they developed based on its data!
Zeon, having the numbers disadvantage, was planning on enlarging their MS in order to bolster their forces!