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"Starwisp," Stross says, will "look more like a DVD balanced on a microwave beam" than the Millennium Falcon:
A tiny spacecraft, the Starwisp, is propelled by microwaves transmitted from a solar-powered satellite in Earth orbit.
Starwisp for establishing interstellar transportation, but it's informational complexity rather than straightforward mechanical complexity.
Robert Forward’s Starwisp is probably a decent idea for a first start.