Set up work area.
Cutting holes out with speed/spiral saw, using circle cutter. This made it so much easier to cut almost perfect circles.
Assembling the box, attaching the adjacent panels to the face.
Adding the side and center pieces.
Adding the back, after sealing all interior edges with the silicon sealer. There's a screw every 3" or so on this box.
Empty trunk, measuring for new trunk floor.
Transfer measurements to the MDF.
Floor installed, test fit with sub to find where to cut joint to still be able to get to spare tire.
Joint cut, hinges installed, test fit again to make sure we cut it right, still able to access spare and battery easily.
Starting to carpet box.
What to do with this edge? well, wrap it like a present, cut down the center of overlap, remove excess. You can't even tell there's a seam unless you get right up close to it.
Speaker terminal cup close-up, almost flush with carpet of box, makes install/uninstall so much easier.