Regarding the jukebox, yes I did put it together myself. I'm an IT guy by day so it wasn't a huge task. I bought a used touchscreen off of eBay that was pulled from some kind of kiosk and hooked it up to a small form factor Compaq PC that I also bought off of eBay. I'm currently just using Spotify for my music, but plan on eventually getting a piece of jukebox software for a nice front-end interface.
Here's the PC, hiding away in the corner.
Pioneer receiver that it plugs into with a 1/8" stereo -> RCA cable
Speakers on each side of the back bar
Better view of the swivel arm that the screen is attached to
As for the cellar room, this house was built in the 1920s so it's actually the old coal-storage room. No windows, concrete all around, shelves were already there...the first time I walked into it I said, "CELLAR!". It doesn't stay super cold, usually 60-65 so it doubles as my fermentation room/random beer crap storage as well. Here are a few pics: