For the actual ark I'll want something more than a plain "slab-sided" hull. I'll need a hinged door in one side, and a bit of trim over that door.
The next pieces to measure and cut are the ark ends. Notice the cut on the ends to accept the sides.
After the ends are laid out and cut, a dado is cut into the insides of the ends; to accept the deck.
Next, I like to layout and cut the bow and stern trim pieces.
Here's the basic Ark's hull with main deck, and stern or bow trim.
There needs to be a top to this main cabin and one more cabin with hinged roof.