Getting back to the enclosure I was making.........MDF is simply not an option if you want to maximize the space in the rear cargo holds and use a normal sized subwoofer . It doesn't make any sense to me to go through all of the trouble to create a sub enclosure for a slim mount if the net gain isn't all that much. Therefore, I've succumbed to making a fiberglass enclosure (first one) but it's gonna have to wait until the temps warm up a bit.