Building Arrow Baskets During Siege for attackers

[Kias]

I like the addition of arrow baskets to refill ammo for defenders, but I would also like to see the same options available for attackers. This could be another optional project built pre-siege, similar to the battering ram or towers. At the least, it would be nice if the old chest or something representing to baggage train was on the map so I could pull arrows from my inventory!

For that matter, more small battlefield additions would be nice to build and control placement. Better barricades, mobile shield walls, or planks to make movement easier could all be options a high level engineer could bring to the table.