You could always steal one of the AIO fans or one of the 3 that come with the case. I just wouldn't want to do either.
This is a great build currently at a great price! The Obsidian 500D is a great case but you could get something cheaper for sure. Maybe grab an extra case fan for exhaust out the back.
This is super cool! And congrats on the feature!
This looks sweet! I love the angles of the tubing, you did a great job!
Did you replace the front Glass panel? I couldn't help but notice the ELEVEN FANS.
Edit: I see the front panel replacement in your description now.
I like the way you did your soft tubing tucked behind the GPU and not the focal point of the overall build. +1 Good Job!