In goes the bracing. I concluded that this was the best bracing strategy considering
the limited material left over. The vertical brace is positioned using an irrational number
to help spread out pannel vibration frequencies.
The horizontal braces are jammed tight against the woofer magnets. I used T-nuts to ensure the woofers
are firmly mounted (but changed to threaded inserts later on).
The tweeter chamber has also been sealed off to prevent the cabinet pressure from
affecting the tweeter.