I got the idea for B323 from Chuck in NJ. Homemade so it fits and does what you want it to. Figuring for sure someone would grab it in a rough sea, I extended that pole down to the counter from the overhead. Now I tell crew to grab the pole, and not the shelf. I used a shelf and like from the modular shelving supplies.
I just noticed I posted my article under Owner Mods/Beneteau/323. More pics there, and other DIY stuff for a 323.