For you information the Mk3A is fitted with 2x R2D2 droids. In the event of an attack they place them selves between the missile and the airframe. They can also be used to fix external problems such as fuel leeks and hyoperdrive problems. (and play chess on long legs)
It also has two small lazer mounts maned by Ewoks placed on both sides of the aircraft to fight of any fighters who come to close.
I hope this is of help.
