construction sites and siege mode

[Mala]

Currently i see a lot of blocking attempts by defenders with the large siege tower.
So why not add defensive and offensive construction sites to prevend this.
Towers and catapults for attackers and healing tents and weapon racks (for additional arrows and bolts for instance) for defenders.

Then catapults and partly sunken walls causes some trouble with the mad design. Is it possible to add a counter to a wall section and it collapses completely, if it gets hit x times?

[cutsomecheesewithmybow]

Also it would be very neat if you could add a failsafe to the building process, because people tend to turn or use siege equipment while it is still being built which ends in stuff being build partially or even getting stuck in the floor.

Also I might add construction is the next best thing after crack and smack and I'd welcome a skill that decreases amount of construction material needed to your construction sites.