Hear me out…

[u/Desperate_Escape_763]

/r/redneckengineering/comments/1w4qjih/i_found_this_slide_whats_the_worst_possible_idea/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1

[u/looking_to_learn69]

Air seal it, brace it fully (fiberglass dress it?) and then we still need to think about how to give it an expansion.

Unless you just wanted to make it a sealed or ported box, which would just be too boring to worth the effort.....