Another issue is I'd no longer be able to use the back sear pass-through to store my hockey sticks when I play on weekends.
Where does the amp(s) mount? ...between the enclosure and the rear seat?
Also, can you fit a full-sized flat tire in the trunk with the enclosure in place or would you have to unbolt it and put it in the back seat? That's sort of an important detail that some people might not think about. It would be a shame to have to leave an expensive wheel sitting on the side of the road if it wouldn't fit in the trunk and you had no means to unbolt the enclosure to temporarily relocate it to the back seat OR if you had to put a dirty full-sized flat in the back seat and mess up your cloth/leather - especially if it's Desert Beige!!! Although, if you had a pretty good sized towel or blanket to put between the tire and the seat, that wouldn't be a problem.
Sorry man, I'm really not trying to knock your product... just trying to point out some details that I think might be important to consider. They really do look pretty good!