for regular 2005 stats, just measure it, give it a good speed, an armor rating and you're done!
depending on how you want this mech to behave, you've got a couple different options after you measure it.
REALISTIK: the mech is basically just a regular tank, but with legs instead of treads, the ability to hold weapons (unless it has mounted weapons, which i don't see), and a higher profile, but not meant to be a particularly over-the-top powerful unit. 3d10 armor (structure level 3), and 10" of movement. i wouldn't suggest any flight/rocket boosters, but jumping and climbing are acceptable.
SUPER WEAPON: the mech is a one-man army, capable of taking lots of punishment and unleashing even more. 4d10 armor for it's thick, reinforced titanium diamond fused armor, and 8" of movement would fit this juggernaut of a vehicle. flying or jumping would shed the whole horrifying-clanky-monstrosity effect.
ANIMOO FIGHTING MECH: this mech is taken out of your generic anime giant robot film. 12 - 14 inches of movement so it can unleash shining finger, and 3d10 armor, although 2d10 would be nicer if you decide on a faster speed. the ability to fly would be a good idea.