How do I make solid entities like boats?

So, I want to make a pirate mod, and I want ships you can walk on and still ride on. If anyone plays PE/BE, you might know that sea adventure DLC about fishing? Well, it has boats you can walk around on, but I want to know if you can do that with MCreator for JE. (In summary: Can I make entities you can walk on like boats but bigger and with walls and doors?)    

Thanks! O_O