In other words you can’t produce any evidence from the Genesis text that the ‘kopher’ mentioned has to be bitumen pitch and black, rather than conifer pitch and clear.
My point is simply that your pretense to know that the ark can’t look like the dutchman’s replica is just that, pretense, based on no real knowledge. Maybe if you look hard enough you can find a second door on that replica to save your sorry record.
Maybe it was pitched, inconveniently with conifer sap, as opposed to the convenient and abundant bitumen, but that distinction takes thinking and isn't clear from the archaic Hebrew used. If the wood was Cypress a powerful argument could be made that it was Cypress tar.
What do we know from the Bible:
Moses was to "pitch" the ark inside and out:
http://biblos.com/genesis/6-14.htm
The Hebrew, transliterated "kaphar" could mean:
appease, make an atonement, cleanse, disannul, forgive, be merciful, pacify, pardon,
A primitive root; to cover (specifically with bitumen); figuratively, to expiate or condone, to placate or cancel -- appease, make (an atonement, cleanse, disannul, forgive, be merciful, pacify, pardon, purge (away), put off, (make) reconcile(-liation).
http://strongsnumbers.com/hebrew/3722.htm
I'm just guessing here, but the first definition to cover (specifically with bitumen) is the one I'm going with.
But wait, there's more!
We don't know what Gopher wood is exactly. It's most commonly thought to be Cypress as that tree was used anciently in ship building, not liable to rot, nor to be injured by worms and was plentiful.
That said, the Targums render it cedar, some think it pine, so whatever he built it from it can't be known to be correct.
But he's gotten the shape all wrong. Make thee an ark - תבת tebath, a word which is used only to express this vessel, and that in which Moses was preserved. So it's most like a chest or covered basket with a lid only larger.
It is definitely not a ship because the Hebrew would call it that. It also is not floating, but sits on a barge.
We have no evidence that there was an exterior deck. There were no windows and it was lighted by miraculous means on the interior.
The Dutchman and all the other attempts I've ever seen to replicate it diverge from the scriptures by trying to make it as modern a boat, only concentrating on the dimensions and not the physical description.
In short, it doesn't look like what you, the Dutchman or any other builder to date thinks it does. It's more like a sealed box.