When you open it, you have all this great space.
Closed, it looks like your typical Armoire. Just think, if you had kids you could lock this bad boy up and they would never have the key to the "magical adult stash/juice"
1- You could easily buy the wine racks to screw/install in the top.
2- A top shelf could be inserted. I am sure an existing armoire you have around the house already has one. Although, you may have to buzz some of the width off depending on the size you wanted.
3-Install another shelf and a puller tray. Which would be quite easy. Pretty much the same concept as a roll out desk keyboard holder.
4- Last shelf would be installed and the grid system to hold the wine bottles. And viola, you just made yourself a PB Armoire.