http://creation.com/one-man-and-a-vision-johan-huibers-ark-builder-in-netherlands
Here is a picture of one of the uncompleted decks of Huiber's full size replica. I think it's safe to say they could hold one heck of a lot of animals in there!!!
Here is a link to Huiber's website where you will find more pictures of the construction of the full sized version:
http://www.arkvannoach.com/index.php/en/about-the-ark/photos-ark
And here is an AP video of a land-based, full-size replica of the Ark in Hong Kong. I'm surprised I haven't heard of any stories of the Red Chinese making life difficult for this Ark museum.
An interesting project. The most ancient shipbuilding techniques are just the opposite of what he used, i.e; the hull was built first and sewn together and then a framework inside built. Since most of the strength would be in the outer hull massive frameworks internally were not necessary.
So even with the tools available at the time, (axes, scrapers and rope) building a large floating box or ark is quite feasible. No rudder or tapered bow needed just water tightness which bitumen would furnish.
Thanks for the ping!