The Earthshakers stands about 13" tall, 13", 6" wide. (if I remember correctly) The purpose of this was more to build something that could weild my Hyper Valkyrie as a shield or weapon. This one is a shield.
Earthshakers are a demolition/excavation mecha designed for the big jobs. Built to take punishment from falling debris, nothing short of 10 H-Bombs can destroy one. Designed for the demolition of massive structures, the Earthshaker has a massive claw for leveling multiple stories at once. The other arm has a shield to protect those that aren't manning it from being slaughtered by the debris. The condemned building usually needs to have a large area of space for the Earthshaker to land, so buildings that aren't condemned aren't damaged. When used in excavation, it uses the huge claw dig massive trenches in the ground. When being used for any job, the legs deploy to keep it stable when working.
It has one use that hasn't been mentioned. In times of war, the Earthshaker can be used as an extremely intimidating and effective war machine. The claw can carve massive chunks out of the enemy's forces while the shield protects yours. The heavy armor protects the Earthshaker from just about anything the enemy can throw at it. Earthshakers are truly powerful mechas.
I look at the Earthshaker and hear this: "The Magitek Research Facility," from FFVI