This is my first version of a project I have been working on, It has many iterations to go before it can be listed on Etsy, which is the ultimate goal, as there were some interesting challenges in the design process.
See the Instructable
The main issue is the central hole size, because wine bottles come in all different shapes and sizes it has to be designed to accommodate as many different shapes as possible. I have been experimenting primarily with different hole sizes but I will probably change the chamfer and maybe use a cove router bit:
The two different sized central cut-outs I experimented with.