Thank you, handy video, friend has just picked up one of these cases and I too think they made an error in the design/build stages for it, he's a bit wary of cutting it, but personally i'd have a whole panel cut to fit in that recess, and then the 140mm circles cut out of it with mounting screw holes cut and then paint it to match the case.
It looks a lot cleaner not seeing that ladder bar mounting thing.... sometimes, in their efforts to provide as many options as possible the initial concepts of ideas, like the clean look in this scenario, gets lost.