I made this for a 140mm fan filter specifically this one: AKASA Aluminium Fan Filter 140mm
https://www.alza.cz/akasa-fan-filter-grm140-alo1-d527216.htm
But any 140mm fan filter should work
I used 4 M5 bolts and 4 M5 nuts to secure it
Its possible that the M5 bolts will interfere with the GPU. I used button head bolts facing in words and it works fine with a MSI 4060 installed.
The author remixed this model.
Original panel provides good ventilation but allows dust to easily enter from the bottom.