When it comes to computer art, I know that Akamatsu-sensei has long done things like buildings and "sets" (classrooms, the insides of homes and buildings, etc.) with computers. I know he has a CG model of whatever it is constructed in the computer, then can easily recreate it on the page, changing the angle of view to suit his tastes.
It wouldn't surprise me if Hata-sensei did something similar.
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