Engineer (SCV) Guide

Role
The Engineer acts as the team's static defense. The Engineer's primary goal should be to create a base and set enough turret defenses so the team will not be overwhelmed by the zerg swarm during an earthquake. By setting up refineries and constantly building turrets and barricades, you should be able to buy enough time for the rest of your team to assault the Overmind.

Skill Points and Items
As Engineer, the general skill order is:

10 Engineering -> 2 Defense -> 7 Offense -> 8 Defense

The 10 Engineering is to max out your refinery, get level 3 power generators, and boost your mule's mining speed. The 2 Defense is to be able to make props, barricades, flame turrets, and science vessels. The 7 Offense is for ravens so you at least have some mobile defense for your hero and so you can build level 3 turrets.

The ideal setup for items would be: level 3 Armor, and level 3 Marching generator and level 3 Geoskanker. The Auger drill should not be necessary as your mules will do most of the mining.

Strategy Edit
Early game, you want to spam mules and mine to find Vespene geysers. Micro your mules so they dont die to acid pools. Once you've found a geyser, set up some power stations next to refineries and create some defenses with your turrets. Don't forget to build props and barricades! The barricades are especial important because the Zerg AI targets them instead of turrets most of the time.

Once you finished with basic defenses, get the turret vision upgrade as soon as possible. As a temporary relief, you can buy a sensor tower for building vision.

Both Flame Turret and Auto Turret provides adequate defenses for your base, but as you'll need ravens, which means going heavily into offense stats. So it's best to build Auto Turrets and upgrade them. If you end up with too much metal, then create some flame turrets too. Even with Mass Turrets, your defenses will still be vulnerable to Zerg heroes, so its recommended to have Sappers build some mine layers around your turrets.

Lastly, don't forget to build an Engineering Bay for your team as without it, they'll be unable to buy a Geoskanker that is important for clearing creep tumors. If the zerg is constantly spamming creep tumors around your base, then you may consider making some sensor towers.

Turret Information

Flame Turret:

Higher Metal Cost

Higher Attack and Health

Reliant on Defense Points for Upgrade

Auto Turret

Higher Mineral Cost

Higher Attack Speed and Range

Reliant on Offense Points for Upgrade