Here it is, note this is the prototype just for proof of concept. Version 2 will have a double baffle with a recessed sub and room for a waffle grille. And yes the seat is still capable of full travel and none of the wiring harness to the seat has been touched. The only real mod that had to be done to the cubby was to remove the bottom 4in. The inner shape of the tub did not match the floor pan and it would have cost valuable volume. The enclosure is made from 1/2 MDF with corner braces, its very strong for its size due to not having any 90 degree angles. All corners are mitered, glued and nailed.
It sound great, handles power with ease. About 1/4 lb of poly fill is added to make up for the smaller size. I pounded the crap out of this for 5 hours on a road trip. No issues at. Its like combining a sub with a dedicated massage chair. And like I stated before all the modules have room to tuck outside the cubby on the outboard side. The only thing left to do is put conduit on the wires and trim the original cover to fit around the enclosure.
The picture of the cubby removed is one I obtained for the purpose of fitting. Excuse the dirt, its been a busy project.