Two inches of armor will shatter any arrow fired from a long bow without much effort. Angled correctly it will just deflect most of the arrows. Two or three two inch plates will shrug off anything, but siege weapons. Also, penetrating the armor a small amount will not do much but line the outside with point bits that fail to hit anything useful... unless the thing gets knocked around a lot they won't hurt the people/parts inside.
I specifically stated that these walkers are for attacking walls/fortresses, the armor is on the front and lesser to the sides. it doesn't need 360 degree protection... it needs to be able to protect the invaders on the approach and give a defensive position (a foothold) on the enemy walls.
Walkers aren't going to be fast/maneuverable enough to move quickly. You need omnidirectional weapons and armor only if the thing is being outflanked. That is something with the base close to the ground. A low center of gravity is good for turning fast in these mecha... so a crawler or wheeled tower fort thing are better for army swarm combat and anti-infantry tactics.
I specifically stated that these walkers are for attacking walls/fortresses, the armor is on the front and lesser to the sides. it doesn't need 360 degree protection... it needs to be able to protect the invaders on the approach and give a defensive position (a foothold) on the enemy walls.
Walkers aren't going to be fast/maneuverable enough to move quickly. You need omnidirectional weapons and armor only if the thing is being outflanked. That is something with the base close to the ground. A low center of gravity is good for turning fast in these mecha... so a crawler or wheeled tower fort thing are better for army swarm combat and anti-infantry tactics.