80 foot tall aliens weighing a thousand metric tonnes -- interesting mix of units there.

Cube-square law anyone? Knees ouch ouch ouch...

Are they bipedal or quadrupedal? What's the pressure of their locomotor appendages (feet in common parlance) in terms of newtons/square metre? What happens when they step onto, say, soft soil or tarmac or anything other than heavily-reinforced concrete? A 1-gee gravity field is a given...