Sometimes I wonder what the thought process behind the gaming aesthetic was. RGB (*if tunable) itself is fine and adds a nice opportunity for personalization, but are those tacky fonts, crystal-facet enclosures, and overall showiness just tasteless or do any gamers actually prefer that look?
You can add another 120mm inlet fan into the cupboard when your temps get too high. Air is same as water, just cause you put a turbo jet super hyper pump to drain your sink does not mean its operating at max effeciency if your tap is barely open. Air needs unrestricted flow in and out.
There’s a passive vent low down to let room-ambient air in (around the corner to avoid direct noise).
Heat rises, use physics where you can - one regret I have is not putting the outlet higher in the cupboard so it could be fully passive cooled.