8 — Supply Depot
8 — Refinery (Gas)
10 — Barracks
16 — Supply Depot
17-18 — 3rd Factory (Depending on resources and pressure)
@100% Factory: Train 2 Vultures
@100% Vultures: Add 2 Machine Shops (Factory Add-ons) and take a 3rd Gas
@100% Add-ons: Research Spider Mines and Siege Mode
4:00 Minute Mark — Build an Engineering Bay for detection and anti-air