This is the space underneath my desk right now... that energy sub is 10x10x16 and fits nicely under there. I want it to my new build to stay under that lip which gives me 11.5" to work with in height. With the grill on it is about 11.5" deep which is completely manageable. As far as length goes I have a lot of play, I can go up to 24".
If I do an 11x11x18 box I figure that will give me approximately .82^3 ft of interior space with no bracing.
I can do this style of bracing
with 4 rows of 1x1 approximately 7" in length, the 16 braces will take up approximately .055^3 ft of volume, the little triangles up against the baffle would make that number jump to about .56^3 ft.
Doing the math that would give my enclosure approximately .76^3 ft of interior volume before adding the driver or the amp.
Would I get similar performance to the Dayton box from a box like this??