I tried for about 4 battles worth and couldn't do it.
I tried getting in the gunner seat and letting a bot fly (came close a few times) and I tried piloting a straight course, switching positions mid air to launch the harpoon, switching back to fly circles...lets see Mr. Skywalker pull that off!
In the end I focused on taking bases and limiting the Imperial rush and was able to defend the generator.
So I guess in conclusion: If you want to win the battle solo, ignore the walkers; if you want to take one down for the memories, get some snacks anda good spot onthe couch - cause you'll be there a while! (not that thats a bad thing)
Anyone noticed how usefull trenches really are?