I made a custom fiberglass enclosure with a JL Audio 10TW3-D4 shallow subwoofer several years ago. Sadly, I've traded in the ST and no longer need this setup... It hits hard for a 10" shallow sub and sounds really good, I already miss it dearly. About 0.9 Cu Ft of internal volume if I recall correctly when I first made it. I installed the JL Audio grill to protect it, and as you can see it's taken a few hits over the years. Nonetheless it still kicks and I want this to go to a loving ST home. It will require making a notch in the floor cover but it's not hard to do. Willing to part out the sub itself if I don't get any hits for the whole setup. Welcome to answer any questions, please inquire!