Was just about to post about the seaworthiness of this vessel - you beat me to it!
On the size - the specifications are well documented, whether the Ark actually existed or not:
"The structure of the Ark (and the chronology of the flood) are homologous with the Jewish Temple and with Temple worship. Accordingly, Noah's instructions are given to him by God (Genesis 6:14–16): the ark is to be 300 cubits long, 50 cubits wide, and 30 cubits high. Commonly believed is the notion that a 'cubit' is equal to 18 inches, or the length of a man's arm from elbow to fingertip.
Scripture, on the other hand, in conformity with its parallel to the Temple, prescribes unique measurements for such a 'sacred,' or 'long,' cubit. In Ezekiel 43:13, the dimensions for the sacred altar are noted to be in such cubits as "that cubit being a cubit and a handbreadth," or 21 to 25 inches. This would result in ark dimensions of 525-624 ft. x 87.5-104 ft. x 52.5-62.4 ft., or roughly the size of the aircraft carrier USS Independence.
Some assert that these dimensions are based on a numerological preoccupation with the number sixty, the same number characterizing the vessel of the Babylonian flood-hero. Its three internal divisions reflect the three-part universe imagined by the ancient Israelites: heaven, the earth, and the underworld." - Wikipedia
Looking at it - I'd say high risk of 180 degree flip if the seas were very choppy. I've been out in seas with up to four foot swells from peak to trough and it was exciting (and 4 feet is not extreme)! I was on a sea-worthy racing vessel though.
Two Quiz questions:
1) "What's a cubit?" - Name the source of this quote.
2) If an Ark were constructed in qubits instead of cubits, what special properties would it have?
Volvo 70 - A Round the World Racing Ark
See the ball, be the ball. - Ty Webb