That takes care of part 1 the crane which is actually the easy part, it's planting the hack box on the missile controls that is hard as heck
Okay then!
The REAL part 2:SOLDIER: Give out ammo to your counter-snipers, Medics, and Engineers. Same as always.
TIP: Napalm can be deadly against snipers. Coordinate an attack with a fellow soldier and trap a sniper in with napalm.
ENGINEER: Place turrets on the balconies facing the hackbox, and put pyro mines right next to the hackbox to burn the smart engineers that run back and forth while removing it.
TIP: Buff your counter snipers! The more damage they do, the faster those pesky balcony snipers go down!
MEDIC: As always, buff the main class to the brim (operative). Place a FRU in the small openings below the balconies next to the hackbox to help them heal.
TIP: Lazarus grenades are also very important in this part. If the area is too hot, throw a frag and a Lazarus grenade down, disorienting enemies and reviving your teammates.
OPERATIVE: Throw down a sticky grenade at the hackbox to kill unobservant engineers while they remove it. Caltrops thrown at the ramps leading up to the hackbox and the sniper positions can give you some major XP, and damage people coming up, making them easy prey.
TIP: There is a small sheet of metal behind the hackbox that you can hide behind and avoid snipers. Keep moving, as they can hit your head with a very well-aimed shot.
I'll get into more detail tomorrow. Don't have the time to type my strategies tonight.