The Bunnings Workshop community can help with your home improvement projects.
Like the idea, I remember seeing an outdoor shower made of glass bottles, very inspiring!
*squints* Is there covering above the door or just string? If not, the heat & humidity will escape straight away?
Let me mention @greygardener to see if they can answer your question. From the image it appears that there are no bottles above the doorway.
Workshop is a friendly place to learn, get ideas and find inspiration for your home improvement projects