Got a lot done today, the carpentry aspect of the box is complete, it just needs to be glued together. I will have it all glued up tomorrow and hopefully will get to hear it on Wednesday!
Cut out the holes for the sub, test fitting:
Checking the mounting depth, the sub clears just barely.
Since, there is a pole-vent in the magnet I need some more room, or I just took a precaution and gave it some more room to breath:
It has about an 1.5" behind the magnet, I think it will suffice, it will have to regardless. I got everything wired in to mount, and to check the excursion, I was concerned about the space I had between the subs and the floor.
Since my concern became a reality, I decided that I was going to raise the box some, so I tacked on 1/2" birch on the bottom. It's kinda hard to see in this picture, but you still can see, the birch is a lighter color.
Now I test fitted it one more time, and the see latches down, which is great! However since it was putting a lot of pressure on the bottom of the seat I raised it a 1/2" with some birch. I don't think the birch compromises the structural integrity of the seat, but the nuts for the seat had less bolt to grab onto as a result. I'm not sure if it is a problem with the 1/2" riser, the nuts did sink down quite far onto the bolts. I think I will run a router along the mounting depth risers and sand them down some to try to make it an easier fit on the seat.