You know, the ark was a pretty good sized boat. At 300 cubits i length, and a "royal" cubit being in the neighborhood of 16 to 18" in length, the Ark could be as long as 450' - no small craft even today.
There is a dutch reproduction: http://www.pbase.com/paulthedane/noahs_ark
It looks like it's time to send this one up again. It makes it so much easier to give coherent answers when you have this information and a full explanation of the problem.