Game mode concept: castle defense

I had this idea a while back, during Junkstein event but had forgot about it until I saw the other game mode idea here today.

Map mode idea: Castle Asymmetrical attack/defense General layout: Large central area with 3 lanes projecting out 1 North, 1 South, and 1 center.

The attacking team starts split up into two teams in the North and South lanes, randomly split, and will spawn from there until they take objective A. The center lane is much shorter and spawns omnics (similar to the Halloween event) that are friendly to the attack team and attempt to destroy the castle gate. Destroying the gate is Objective A. The defending team spawns from an assault ship on top of the castle.

In addition to the gate there are 2 turrets along the North and South lanes. The turrets have similar health and damage output to a Lvl2 Torb turret but the turrets are only active if a defending hero is close to it (an activation radius about the size of Soldier's heal). The defending heroes can collect scrap from destroying the attacking omnics. A turret can be repaired with 5 scraps or rebuilt with 7 scraps. In addition to repairing the turrets, 10 scraps can be used inside the castle to create sentry bots that aid in defense during objective B, however scraps can only be collected during Objective A so the defense has to balance maintaining the turrets vs. fortifying objective B. Up to 6 sentry bots can be created for the defense. The sentry bots are "one time" but are very durable (1000 HP). The bots can fire but do not do a lot of damage, about the same as a Lvl1 Torb turret, however the attacking team cannot capture point B while Sentry bots are active anywhere inside the castle. During Objective B the attacking team spawns from just outside the gate destroyed during Obective A and attempt to capture the Castle control room on the third floor. The defending team keeps the same spawn, on top of the castle above the third floor. Any sentry bots the defending team built will roam the castle and engage any enemy heroes in their line of sight. Once there are no more sentry bots the attacking team needs to hold the Objective B point for 5 seconds to cap it.