A friend and I decided to stage a different style of X-Wing game earleir this year, with the Rebels raiding a small planet-side Imperial garrison. Some spraypaint on a collection of mushroom boxes & other everyday containers, sandpaper as streets, plus some printed Imperial insignia and we had a base. The gun-turrets were Lynx spraycan tops (with last-minute rawl-plugs gun-barrels), all on a 'Mat-O-War' terrain-mat.
There was a series of primary & secondary objectives that the Rebel attacker was free to go for as he wished: a fuel-tanker transport, Imperial shuttle, local planetary shuttle, the Imperial command-centre (latter would influence the enemy reinforcements response times) and general installations, plus dealing with TIE and turret defences.
The TIE fighters on the ground rolled an attack-dice to see if their pilots were ready for take-off (hit), ready next turn (focus) or snoozing in their bunks (blank).
The only rule we needed to handle the ground terrain was that once a fighter-base was partially on a building top, it was allowed as much extra movement for the model to be properly balanced on the building.
The game was not designed to be balanced as it was a surprise-attack, but it was challenging for attackers. The end-result was a fun game, with plenty of explosions, a daring Imperial ace, a heroic death-run by a seemingly indestructable Y-wing and a successful blow against the Empire!