Noah’s Ark is commonly said to have been about 450 feet x 80 x 50 feet, but the dimensions were actually about 10% greater because the cubit used to design it was the royal cubit, about 20.63 inches long, which was also used to survey the dimensions of the Great Pyramid of Giza, not the common cubit, which was about 18 inches long.
The Bible mentions only one cubit, and since the outer temple wall of the Temple Mount of Solomon’s time has been shown, according to the ruins, to have been 500 royal cubits square, and Egypt’s Great Pyramid was designed to be 440 cubits, exactly, per base side, so the royal cubit, the only cubit mentioned in the Bible, was the standard for the great edifices of the Ice Age, and after, with Solomon’s Temple.
Since the Bible does mention only one type of cubit, the same must have been used when Noah’s Ark was surveyed, derived by measuring the rate of precession, the slow wobble of the earth’s axis, as measured by the apparent movement of the backdrop of the constellations because of it. See how they did it in article #2 at http://IceAgeCivilizations.com, and know that the royal cubit was surely not the length from some king’s elbow to fingertip, as mainstream archaeologists and egyptologists still mostly opine.
And please see http://genesisveracityfoundation.com.