It shouldn't be anything like an AT-AT.
- AT-ATs have very strong armour and heaps of hit points. Gunships have very weak armour and few hit points.
- AT-ATs have a huge range with a powerful area effect blast. Gunships have a short range with many less powerful lasers.
- AT-AT is very slow. Gunship is relatively fast.
- You transport units in an AT-AT for protection. You transport units in a Gunship for mobility.