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As a proof of concept, I rounded up all the spare PC cooling fans I could find... and seemed to move about half the air.
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So you're halfway there. Fabricate a log manifold (no pun!) to manage the airflow. Maybe get some matching fans?
When I worked at Nextstep electronics recycling, I started out in the warehouse, dismantling. I tore apart an Olivetti PC from the 1970s that was way overbuilt (the thing had three motherboards!). It had a [six inch in metric] cooling fan with a cast aluminum body. It would replace any two of the ones you show. Prolly still around here somewhere, it turned into sort of a souvenir.