It's running at 88c under full load so it's not exactly working perfectly. I've had to tweak voltages and fan/pump settings to get it stable. The 9900ks hits the high clocks at much lower voltages than the 9900k which is about the only way to hit those numbers.
The mag mount for the front panel is a super good idea. I've got this case on order and was trying to think of a way to cram some fans in there, that should work great! Thanks for posting.