This is certainly not bad, have you considered looking into T Gauge? I would guess you'd have a field day with it!
Yes, I know T gauge and have seen the models in Nuremberg. The company has announced an intercity express and if the intercity express appears, I will certainly realise a airport railway station like Frankfurt/Main. Another possibility would be the simulation of a rapid-transit railway with a railway station at a Japanese airport.
Thank-you for presenting another great project. It is hard to believe that such detail can be achieved in the small scale. Excellent--grade = A ++ . I think including local scenery like this around the airport's perimeter is really fantastic, because it gives the diorama a sense of time and place.