X3 looks nice btw, one of the first bitcoin asic system designs that appears to make total sense (from cooling perspective).
I agree. Nice clean front-to-back airflow, no wasted space hampering air flow. Best design I've seen.
Only minor issue I see, its not clear to me how the PSU is supposed to breath. Is that BA logo plate really a grate, or is it breathing from the side of the case (not ideal for a rackmountable) or from inside the case, which is also not perfect.