Here's where I saw it the first time - and the writer mentions he heard it somewhere else - the idea has been around.
He mentions the crux of the matter - tie a string around the neck of the bottles so you can fish them out if they're more than one deep. Good idea.
https://www.triton381.com/projects/s...nder%20Storage
This guy used to do boat restoration, IDK if he's still in business, but his work and attention to detail is completely over the top. It's worth poking around on the website to get ideas and inspiration.
One fun project: He turned a Triton into a big daysailor...