So far we have a well developed novel around micro events and a back drop of war with decent information. As far as any of this ever been real, we observe that serious science questions are been simply ignored and this problem gets immediately worse in the next few chapters inasmuch as they are not even acknowledged let alone glossed over with a hand wave.
The attractiveness of a round craft is arguable in terms of aerodynamics and the mere fact so much was done experimentally tells us that this was not misplaced. The problem is that weight climbs exponentially as the craft gets larger and large is necessary in order to put in the large engines and life support. Add in duct work for airflow and i simply do not know where this design can go. And that is before convincing me that it will ever fly.
None of the UFOs ever showed much concern for aerodynamics which informs us that air flow is not ever used to manage thrust.
Thus i simply do not think that these craft can ever be built using airflow technology and we surely have plenty of failed attempts.
So far we are developing an interesting historical novel with interesting names and insights to the times.