When Elon Musk plunked Tesla’s gigafactory on the east side, some say it was like a lightning strike that lit often-overlooked fields on economic fire. Long before Musk, some locals saw potential in the area and snatched up tons of land. Their plans for it are actually more ambitious than Tesla’s CEO — and buildings are already going up. A Ferris wheel hotel fit for Vegas? Landing pads for helicopters and flying cars? Hydroponic lagoons and underground data centers? The Austin area hasn’t seen a plan like this. No one has.