07-12 Altima sedan. Does anyone have the trunk interior dimensions?

Currently have a system in the trunk of my 12 sedan Altima, so it’s a little difficult to get precise measurements especially with the current system on top of the floor and spare well etc. Anyway I’m designing a quad 12 enclosure and I’ve been searching the net for days. And can easily find the trunk has 15.3cuft but that’s it. No further dimensions, hell if anyone has an empty trunk and can pull the floor and spare out to measure it all up or has already been down this path throw me a bone please😂