I just got finished setting up my new-to-me trailer. I had my old trailer set up just about the same way except I had checkerboard vinyl tiles on the floor. Here is what it looked like when I bought it:
I had the base cabinet from my old trailer. The tool box and fold down bed/couch came with the trailer. There are two small 2ft lights on the left side near that roof that supply the lighting. I painted the entire interior, put up two new cabinets in the nose, put up a new shoe caddy bag on the wall, e-rail throughout and I'm trying out commercial grade carpet on the floor. I would love to put in two Pit-Bull TRS's, but I don't have $500 laying around. I had $40 and a welder, so I've designed a cheap alternative that I think will work wonderfully. I'll post up pictures of my finished product when I get them mounted up. This is what it now looks like: