This is a Sengoku ship era paper craft made by Akai , a Japanese papercraft designer.

The Sengoku ship is a 17th century commercial transport ship that was used to transport 1000 tonnes of rice. It’s a really big ship at the time and is highly regard as valuable.

According to Akai this model is best made on an A4 paper but some parts may require a thinner paper to make it easier in assembling.

I’m not so sure if my translation were correct though.

For more information and instruction you may visit Akai’s website