Do you still have the plans for the box, you made??Just finished building my own box. I wanted to keep the storage bin under the back seats so this was my only option. Took awhile to build since I’ve never done it before but happy with the way it came out. Box has somewhere around .57 - .59 cu.ft. Volume.
Using: 1-10” JL Audio 10W1v3-2 sub & Sony XM-GS100 amp.
When I have time I will install it.