I'm really leaning towards the acoustically transparent screen and putting the speakers behind it. This cabinet needs to exist for many other reasons (hide the rack, store many larger items that currently don't have homes, house the bar, etc) and with the cabinet in place there is really nowhere for floor-standing speakers to hide besides behind the screen. With all the space behind the screen to play with, I could fit three
ADAM Beta Mk2 speakers back there. Though I'm not sure how much reinforcement the surface would require to handle 6x 10" woofers, 3x 7.5" Mids, and some tweeters.