The purpose of this map is purely to demonstrate how to make am independantly rotatable turret.
Simple map. Use your tank to survive 10 waves of zerg.
Movement is standard WASD. Use the camera to control the direction of the turret.
Press R to enter vehicles (the viking doesn't shoot).
Press E to change the Siege Tank in and out of Siege Mode, or to change the Viking to Assault or Fighter mode.
This project is abandoned, feel free to rip it apart.
The things you should be interested in to recreate a rotatable turret are the trigger "Attack Turret" and the data changes I made to the Siege Tank's turret and weapon. The unit "Turret Target" listed under Terran melee units is also important.