It does. We have specific instructions in God's Word.
It will be 300 cubits long (137.16 m, 450 ft), 50 wide (22.86 m, 75 ft), and 30 high (13.716 m, 45 ft); it will have a roof "finished to a cubit upward", and an entrance on the side.
You need to reread the Bible. That ark is completely wrong. We’ve been tricked for decades by artists who mis-imaged the ark.
Noah’s ark is all black and tight as a drum. There isn’t an upper deck at all. It’s lit by a tsohar.