[Fyron]

Start the game and control all human empires. Build 3 colony ships, then scrap everything on the HW, space the people, and abandon it. Then, once all empires have just the 3 colony ships, put it on PBW and get going.

With TGE III, Geo used a mod to generate turn one that made the HW planets have 1 max pop and 0 max facility spaces, so they start out empty. Then, he processed a turn with stock SE4 to get it back to stock and uploaded that as the first turn on PBW.