I've just finished building a Kodiak walker. It's 70mm to the top of its "face" and 80mm to the top of the ammo drums on its shoulders (the highest point)
One thing to note with that walker (on my copy anyway) is that there's a gap of a couple of mm between the ammo belt on the arm and the drum on the shoulder. I ended up having to make a mould of the ammo belt, casting it in greenstuff and cutting out some bullets to fill it.
Another thing is that there's a metal plate that goes on the back. Even with pictures I couldn't work out where to attach it