Good stuff. I remember looking briefly at the box you posted, some of the dimensions where missing but the port was probably about 127cm2 if I am not mistaken, and a 90cm long port at that size for an 8" should be fine though I never did any sim of it. Ridiculously busy this year, no vacation working working working...
Running a very basic setup with meanwell psu and old car audio amp but it sounds great even as with the low pass set to 50hz. The meanwell has a fan that is too loud, don’t know if best to tinker or to just go for it with a Hypex amp that I can put in another box to the side.
Next to learn to measure with a mic and post the proof.
