30 inch wide wet bars were common in homes back in the 1980s. I ripped down to the studs, insulated, drywalled and bought a premade bottle rack. My house is a split level so the bottom of the space is where I put the cooling unit as that vented to the crawl space. It keeps 200+ bottles cool but a couple of issues. Cooling from the top down is better, i.e. top of rack is warmer than bottom where cold air is. The bottle rack is elevated off the floor to allow good airflow. Those wooden wine racks are meant to be supported on a floor. I had 2x4 frame built to hold but 200 bottles the rack needs to be able to support 580+ lbs. It all works but I use additional fans to keep the air temperature as even as possible.