rail mount

Hi, I found these pictures online. Any idea where to purchase the "shelf" that is attached to the stern railing? Any idea what its called? It looks like its the perfect location to keep a cooler or a small generator, especially on the limited space of a Hunter 260. I wonder if it flips up if...

I have a dinghy with a Merc 5 hp 4 stroke motor. Both motor and dinghy are hanging off davits on my Hunter 33.5. I will be moving the boat to new moorage and need to "shorten" the boat and take the dinghy off the davits. I was thinking of putting the Merc on a rail mount but it seems a bit...