Loved the idea. I wanted to use a Notcua 40x40 instead of the incredibly noisy fan that came stock. Instead of going with the 4x10 that has the same dimensions but moves way less air, I wanted to use the more powerful 4x20 but still maintaining the original appearance, so your model was perfect for me.
The print came out wonderfully. The posts were -as described by other users- kind of fragile for the tiny wall dimensions, so I used an M3 tap (as shown in picture) and simply reused the original screws that came with the stock fan. No problem with that.
I used a buck converter to step down the voltage from 24V to 12V and put it in the electronic enclosure.
Custom supports added in simplyfy3D to fully support the two tabs;
Printed with the fan shroud flat side on the build plate.