Not axle, and it's NPC FAST.
Use hex plates instead, make the chassis smaller, drop the armour to plastic 3, add more razors.
It doesn't look terribly bad. I might actually try Hexplates with three razors on the edges and one on top or something like that. You could upgrade the weak poly extenders at the back, I reckon they might be very suspect. Maybe shorten the extenders holding the piglets on, and upgrade the armour a little bit. Tiny Plastic 3 chassis like that probably isn't going to last too long.