I think its mint, great idea and would love to fly it. Considering all the hassle and cost of moving large bits of kit from A to B with road moves, cranes, roads, shipping costs ...... whats a day or two delay due to wind, or even a week. 5 day endurance thats not shabby.... and they have only tested that probably with FTL in mind. Good luck to them I say, we need more people giving something a shot in aviation, because there is enough saying you can't do this because ........