2019 Tundra Subwoofer Enclosure Dimensions

Hello I install car audio and build enclosures. And a good friend of mine is having me build him a box for his Tundra. I have found a few designs online and they look slightly complex. None list any dimensions. I was wanting to know if any one here has enclosure if so could you please tell me dimensions? And brand and location? Meaning under seats or behind seats. Also model of your Tundra. Any help would be greatly appreciated. I did a search on here for subwoofer enclosure dimensions and came up with nothing. I no longer live in San Diego so I'm like 4 hours from his truck. I would just like to have a idea of what I'm looking at as far as cubic feet and amount of wood needed. Thanks again. Oh I included a pic of his truck.

 

Well thank u for your help and assistance