I think this is what you have.
By the looks of it, I don't see any reason you can't do what you want to do.
I'm not sure how deep it is, but without the slide box in there, you should gain some space for sure which I think makes up for the 'convenience of a slide out box to access stuff.
Good luck! Mitch
2013 F150 XLT 4x4 SuperCab Max Tow Egoboost 3.73 gears #7700 GVWR #1920 payload. 2019 Rockwood Mini Lite 2511S.