5x8 V-nose sleeper help/ideas please!

I’m in the process of buying a 5x8 cargo trailer. The walls are plywood not chip board. I’m going to stain/varnish them. I’m going to lay a 5x8 carpet over the floor. I’m getting a futon (sofa 73x34/bed 73x43). I’m getting a “buffet” with sliding doors to go in front of it. 40x13x24”tall. I’m thinking of enclosing a porta potty between the door and the bed. I’m also looking at getting a portable fridge/freezer...the ones that look like coolers. I will be adding a dual hose portable AC in the front V nose vented through the floor. I’ll be building cabinets and shelves around the AC.
It has a single barn door. I’m looking for ideas how to lock it from inside.
I’m also looking for any other recommendations!
It has a single barn door. I’m looking for ideas how to lock it from inside.
I’m also looking for any other recommendations!