You need Planks (Of the kind of wood you're building your vessel from) A nail, hammer and saw. The frame comes in three sizes. Small Medium, Large or Small. Small frames cost $10 Medium frames are priced at 50k and Large frames are priced at 100k. Once the frame is complete, you can start connecting the planks. To finish the exterior of RS gold your boat, you'll need about 100 planks. As your level advances you'll be able to add more to your boat. You can grow the size of your boat or buy multiple boats. Think about it. A whole fleet of boats in your possession (If you're wealthy at all).
After you have completed the exterior of the boat you must build the inside. A work crew can be hired to construct decks, cabins for crews (Crews are explained later) and various other rooms (Most types). It can be constructed using plansks or bars made of metal. A wheel that comes with the frame is a crucial tool. Once you get that done you are able to cheap RuneScape gold climb an incline and begin to build rooms. One deck is on the lower portion of the small vessel (formerly known as the frame).