The whole thing is simply a joke.
What is so sad is that by the Bronze Age, sailing and boats were very, very sophisticated. If you move forward to the Iron Age, they were even more advanced.
So why would GOD tell Noah, "Hey Noah, completely disregard every thing that works and do it this way". The only possible explanation I've ever heard was that Noah was actually talking to Cliff Clavin,
Now I can easily believe that Cliff designed the ARK.
Aslan is not a Tame Lion