This was one of my own first two thoughts on TFA, the other being that given this as a proposal, one clear advantage of offshore windfarms is that transporting

This was one of my own first two thoughts on TFA, the other being that given this as a proposal, one clear advantage of offshore windfarms is that transporting construction modules to the site should be vastly more straightforward: ship or barge towers and blades directly. This could work for farms both in ocean waters or large lakes. But other than that, the idea that blades might be shipped by some other mode (overland, barge, special-purpose rail, possibly) to a proximate location, then drone-ferried to the actual construction site ... seems a more viable option. And yes, drone lift-swarms comprised of multiple units yoked together and lifting a blade or set of blades ... seems more viable. Distances travelled should be relatively short (roughly, 10s to a few 100s of km), transport speeds need not be high, and flight profiles could be quite low altitude. Even if not drones, a ferry aircraft that could transition between vertical and horizontal flight modes, similar to the Bell Boeing V-22 Osprey, but, say, with an open cargo frame, might be a better fit. These could take off from a standard runway if desired, but also land and take off vertically from a cleared landing zone (potentially a barge or floating dock, in the case of offshore farms). Airships might be another option, though the ballast problem (as cargo is offloaded, an equivalent weight of ballast would need to be onboarded to prevent the airship from floating away), and poor handling in even modestly windy conditions (likely around wind farms) would probably prove problematic.