I think it's safe to assume that Noah had knowledge of proper boat construction. .
Noah himself had all the shipwright knowhow?..how do you draw such conclusion?
If So, God would not have to provide the plans, Just tell Noah what he needs to transport
and Noah would be able to work the size and shape out himself.
God gave Noah the task/project of constructing an Ark, but he may have hired people with the required
skills to complete the task...ie; Noah being overseer or project leader.
With Solomon building the temple, at least we are told he drafted forced labor out of all Israel.
and also used resident aliens in Israel which were listed on the census done by his father David.
... it's also safe to assume that God would allow Noah to build a boat that would not be
a torturous ride in rough water. For those reasons, I believe the Ark would have resembled a boat more than a box..
Rock Chuck said God steered the Ark because it didn't have a rudder,
I gather God could also use his powers to steady a box hull ark in rough waters.
either way wild guesses and assumptions don't confirm anything about details that don't appear in scripture.
