I like most of what i see, but just one point that gets overlooked in the large mecha categaory; Ground pressure. Large armoured Biped has an immense amount of ground pressure. any soft terrain will bog it down unless the feet are large enough to reduce the ground pressure. In Urban terrain it would just fall through the street into the sewer. Tanks have the large tracks to reduce the ground pressure for the 70 ton metel monster rolling around. Mecha still have to face the ground pressure problem in whatever environmet they are going to travel.