I cannot speak directly to your question concerning 50 ft and over cats. We did a trip 3 years ago with 12 on board a L45 with 4 cabins, 4 heads, and two small births in the bows. 8 adults and 4 kids. We are all family so everything worked for us. We chartered from DYC out of Scrub Island and had no problems getting provisions delivered to the boat from Tortola. Also, Scrub's facilities are a great place to do the sleep aboard before starting your trip or at the end of the cruise. We flew into St. Thomas and had a private water taxi take us to the BVI which was well worth the cost vs using the ferry. They took us to the west end and the captain went ashore to clear us in while we all enjoyed cold beverages on board, then they took us directly Scrub Island to board the boat and picked us up at the Scrub Island dock for the return trip back to STT to fly home.