The ship in the Admiral's Bundle is a Royal Navy Skiff, I think. I believe many of the ship parts vendors have lower level parts for both the Royal skiff and the Cutthroat Pirate frigate. However, you should be able to get Royal Navy upgrades from the ship parts vendors in Port Regal and Hamamitsu. There are actually two ship parts vendors in the Hamamitsu gardens - one sells upgrades for MooShu ships, and the other sells Marleybone parts.
So far, I've found ship parts vendors in Jonah Town, Flotsam, Scrimshaw, Puerto Mico, St Bonnobo's Abbey, Cooper's Roost, Bison Village, Tumbleweed, Port Regal, Hamamitsu Gardens, and Subata Temple. There might be others that I've missed.
Marleybone ships and their story: Marleybone ships can be found in three different places: One- you buy the royal navy skiff in port regal Two- You buy the Admiral's Bundle and get the ship Three- You can buy either the frigate or galleon in Hamamitsu Gardens, by the life fountain
How do I get gear for my new ship? Each place you buy the ship will have a vendor next to them, if you walk up to them, they offer you every single piece of equipment needed to fill all slots. These items are the least powerful for that ship (unless you have a piece of equipment that has the classification "any" on it). The way to get better equip. is to either find a later ship parts vendor in the story, or from drops.
What levels do I need for my ship? Skiff: 24 Frigate: 36 Galleon: 40 Warship: depends on tier you select
Min. levels for max. equipment: Skiff: ?? (someone help here?) Frigate: 44 Galleon: 48
I hope this helps everyone wanting to know about marleybone ships! Heavyshark