This is the issue that started me down the road toward learning TTAT.
A ship the size of Noah's ark could never have fit all the animals that the bible says it did and could not have contained all the types of food and environmental requirements of the divers animals said to be onboard. Realistically for this feat to have been accomplished, the ark would have had to be the size of a small town. So yes, Simon, I agree that even the Peter Schelte would be too small.
More research proved to me that a family of eight people could not have built even the undersized vessel that the bible describes. The amount of material needed would have required an army of workers given the tools and raw materials available to them at that time. Let's say that Noah and his family defied all odds and actually did build it themselves, it wouldn't have mattered because the ark wouldn't have floated, or it would not have stayed afloat. Ships the size of the ark didn't appear until modern times because it takes a steel superstructure for the vessel to be seaworthy. A wood keel and superstructure would have folded like a house of cards under the pressure of the flood. Further, wood degenerates so that by the time Noah finished building the ark, most of what he had built would have rotted in the interim.
This story always seemed fishy to me but I'm ashamed that it took me years to see it for what it is, a complete sham.