Bracing was accounted for but was not included in the design sketch. Bracing from side to side and top to bottom will be more than enough.build it loke tha tand it will break apart.
you need to double up on all the walls, including the port
that will change the measurements quite a bit
it's not about it breaking apart really. it's about the panels flexing, which changes the volume and tuning as it flexes.im not worried about it breaking apart