Very interesting. I wonder though what is the exact use case for this kind of transportation, i.e., in which way it is superior to the current way of transporting goods.
It's pretty rare for construction crews to be sitting around waiting for delivery trucks stuck in traffic. I mean it happens occasionally, but the traffic in most places isn't that bad. And contractors usually schedule deliveries in advance, or shift their crews to other job sites if they know a delivery will be delayed. Any contractors who couldn't manage such basic logistics have already gone out of business.
I predict that drone delivery will never be used for heavy, low value items like sheet rock. The costs of flight will remain too high even with better batteries. If delivery drones are used at all it will be for small, high value items like medical supplies, electronics, cooked food, and toiletries.
I will admit I was extrapolating from a single experience of helping finish a room. It sounds like that experience might not stretch as far as I thought.
