Reeds would make up the hull of the craft, wood the actual space for living quarters on top. There is clearly a wood structure on top of the reeds in your picture.
What do you mean "if there was such a distinction then"? You are the guys who don't believe in evolution, remember. The diversity of freshwater fish is enormous, and most won't tolerate salinity for even a day.
Evolution is the transmorgification of one species into another new one. Natural adaptability within species when confronted with new environments is clearly shown within our own, where all the different races of man, adapted as they are to their environment and diet ultimately still derive from one man and one woman, and in such famous examples as the Pepper Moth (do I have that name right?).
Small boat designs don't scale because the stresses on a boat go up according to a power of its length while the strength of the materials remains constant.
With this dicta, one must wonder if you ever studied fluid mechanics, and the manner of modeling large structures with scale models to test strength. Because that is how its done. Its not that you scale up a small boat. Its that the concepts of the large boat may be tested in an appropriately scaled small one, and new small ones can be derived from the principals used to make the large one.
As I say, let me know when you've worked out how to make a craft with an enclosed cubic capacity 2000 times greater than the copied Mesopotamian design using bronze-age materials and technology. Hint: A reed raft (or any other kind of raft made out of chopped plantlife) won't cut it.
Evolution is the transmorgification of one species into another new one.
No, speciation is part of evolution, not all of it. But anyway, there are thousands of species of freshwater fish, which would have to have been preserved in aquaria on the Ark, fed, cleaned frequently, unless you accept that evolution can result in greater diversity than (for example) ape diversity.
Natural adaptability within species when confronted with new environments is clearly shown within our own, where all the different races of man, adapted as they are to their environment and diet ultimately still derive from one man and one woman, and in such famous examples as the Pepper Moth (do I have that name right?).
The human race does not derive from a single man and woman. Our most recent male universal ancestor didn't live at anything like the same time as our most recent female universal ancestor; and both of those people were part of much larger populations who also contribute to the modern gene-pool. The genetic evidence for that is quite clear, but I don't really want to get into a debate about that while discussing the engineering impracticality of the Noah myth (even though it is genetically quite clear that the human race does not derive from 3 brothers and their wives of around 4500ya, nor do other species show a genetic bottleneck at that date).
With this dicta, one must wonder if you ever studied fluid mechanics, and the manner of modeling large structures with scale models to test strength. Because that is how its done. Its not that you scale up a small boat. Its that the concepts of the large boat may be tested in an appropriately scaled small one, and new small ones can be derived from the principals used to make the large one.
My major was Civil Engineering. A large part of the course was fluid mechanics and hydraulics. It is painfully evident from your beliefs about Noah's Ark that you have no concept of those subjects. It is true that models can be used to test design concepts under controlled conditions, but that has absolutely nothing to do with the fact that small boat designs don't scale. Typically the models used are solid and their strength is totally irrelevant. You can learn about what the stresses on the scaled up craft will be, and how it will behave, but you can't just take something that works in small scale and multiply all the dimensions up and expect it to work in large scale.