Mele kalikimaka bro. It’s actual volume after displacement is slightly less than 2 cubes. So you could add a brace in there or two to get it to 1.75. Lmk if there’s any questions.
The way way I build it would be top and bottom pieces same size and everything else is sandwiched in between. The port start it behind the front panel. So make sure it’s 3.5. And then the second part of the port. I put it on the side of the first part. Make sure u double check to make sure it keeps the 3.5 consistent all the way through.
I also used end correction to help keep the amount of air space the port takes up down. And keeps your tuning at the 38hz you wanted.
Lmk if you got any questions.
And this is just a box built for his application. This ain’t a built to sundown specs box. Just working with the space he has tuned to the music he listens too.