So with the removal of the top 80mm fans on the Velka 3 v2, I started to see if perhaps 40mm fans would fit. Turns out 3 NF-A4X20mm fans just so happen to kind of fit. I fastened the fans by way of the nuts provided by Michael and used the screw from my nh-l9a for the 25mm fan. I also used zip ties to connect the fans into a straight line as seen below. Here is the placement:
The issue that comes up is with the back connection of MB plate, where the 3rd fan cannot be placed flush like the other and be retained by a nut and bolt. There is a slight piece of metal which protrudes and blocks easy installation of the fans and MB plate to the external case, so I cannot fasten it. Issue seen below:
I was wondering if cutting of that slight piece would have an damaging effects on the cases structural integrity or not @micheal? If not I might try to just do that.