They started by attaching Ikea's 'Vurm' bottle holders to three pieces of stained plywood. The vertical strips rest on the floor, so the weight of the bottles isn't held solely by the plaster walls. The tops of the panels are held together by a white cross-piece which is anchored to the wall, and the white shelf keeps them together at the bottom while also providing a bit of extra storage space. The finished unit looks wonderful, takes up minimal space in the couple's dining room, and cost under $200. Great job, David and Jeanette!