Does this continue to work at scale? Making everything proportional and such… I would guess they had to significantly increase the jet propulsion to compensate.

Since no one actually answered your question: basically yes, you can just scale airplanes linearely up and down. Obviously everything has to scale, like propultion and hydrolics power, but you can esentially make a model aircraft the exact same shape as any large aircraft and it will fly. Conversly, you can test a small model in a wind tunnel and then scale it up as much as you want and it behaves mostly the same way.