You can measure the air space by filling it with water(so you can check for leaks too) then pour the water into a measurable container. Another way is to fill up your odd-shaped box with packaging peanuts or styrofoam and then pour the peanuts or styrofoam into a measurable container like a square carton or something similar.
^^Is it the snout where the sub was mounted that made it look like an elephant trunk that looks weird? I debated if I should do it like that or just angle it from the edge of the sub to the edge of the box but I ended up following the contour of the rear.
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