Meh, it's no fun if there's actually room for everything!

Are the front fans easily removable for draining the loop or do you expect that fan to get so hot as to need extinguishing on-tap?!

or is there room to screw a 90° bend on when necessary?
How thick was the acrylic in your PSU shroud? Mine's metal but the existing holes are in the way and won't let me tidily mount the filter. I'm thinking of just laying a piece of acrylic over the top and mounting into that but not sure how thick it needs to be. I'd look at replacing the whole piece but it'd need multiple bends and it's structural in my case....and also, I'm lazy

Worst case I could vinyl wrap over the acrylic onto the metal so it at least looks like one piece.