I see it's on a barge. I wonder if it would float, if it would be broken to pieces, or what, were it actually placed in the water.
No one really seems to know what “gopher wood” might be in this day and time, so an accurate reconstruction is going to be problematic.
This is not to diminish the man's inspired effort, to make real a Biblical occurrence that is dismissed as myth all too often, especially in that part of the world.