The Torah gives Noah minimal construction specs. Targum Pseudo-Jonathan on (Genesis 6:14) hands him a blueprint.
"Make thee an ark of the wood of cedars; a hundred and fifty cells shalt thou make to the ark in its left side, and thirty and six in its breadth; and ten cabins in the midst, to lay up in them provision; and five repositories on the right, and five on the left; and thou shalt protect it within and without a pitch."
The Targumist is producing a shipyard drawing. 150 cells. 36 in the width. 10 central storage cabins. 5 repositories on each side. The numbers are detailed enough that one suspects the Targumist is working from a genuine carpenter's imagination — or from an older tradition preserving a more technical account of the ark's interior.
What matters theologically is that Noah was not building a vague boat. He was building a structured sanctuary for life — with distinct compartments for different kinds of creatures and their food. Every cell was a promise that the species it held would survive. The ark was a miniature Eden: an ordered shelter in the middle of a chaotic sea.