Need custom enclosure that still allows access to car seat anchor

2011 double cab non jbl. title says it all... I have two kiddos in car seats so I need to be able to anchor them to the back wall removing every sub enclosure I have come across. I can't imagine I'm the first person who has wanted something like this. Can anyone point me in the rot direction? Thanks!

 

https://www.tacomaworld.com/threads/2005-tacoma-double-cab-complete-audio-install-tutorial.16252/

 

Thanks. I reached out to Mr Marv to see what he can make for me

 

You can create a box that will sit below the seat anchors. Really it depends on what you are trying to put behind the seats.... 1 sub or 2?

 

Pulled the trigger on a box from mr Marv.