Update - sold to a forum member, thanks for all your interest.

The holes were cut for a functional reason; the air supply in the build came from below, not the sides. We just put masking tape over the grilled inputs and it worked like a dream; I'll admit they could have been more aesthetically cut but max airflow was the order of the day. If you're installing t...

Cleaning out my cupboards I have found a pair of the Phoenix M Series Fan Shrouds. They are shaped to match the contour of the M Series; no idea how rare or otherwise these are now. I used these many years ago with a pair of M50's side by side, and perspex mounted on top of the fins to create the co...