Great job Bret !! I love those colors in the bathroom.
Be careful with messing with my big windows !
I hate the sheetrock dust most of all. Never have your Heat/AC running when sheetrock sanding is done.
On that sub woofer enclosure look into proper porting of the enclosure for better sound and effect. You going to run an equalizer ? Glue/and or foam those speaker frames to avoid/lessen vibration.