Q&A for How to Make a Cardboard Ship

Yes, but you can use talc powder and water to make a mixture to cover the ship to make it waterproof (don't add too much, as it might sink the ship).

You can purchase one relatively cheaply at your local craft store.

Not necessarily. If you don't plan on putting it in water, it does not need to be waterproof.

Follow these same instructions, except make it longer and add some Viking details.

You can get a hot glue gun at a craft store, a major retail store, or online.