@Garnett
Can I ask some Qs about that P400S of yours...
1) Does removal of the PSU shroud mean drilling rivets? looks like to me ...
2) If you open that vent in front of shroud, does a HDD fit?
Might make sense if I explain my idea... NOT using Phanteks mounts, I may sit a rack of HDDs directly behind intake 120mm fans from floor to ceiling. I wonder if I need to merely open/remove that vent or need to remove the shroud, cut it to size and replace it. Would be removing the supplied HDD bays from lower compartment and just doing my own floor/ceiling setup
Hope you can help as dont know anyone with this case