This is more like it.
I don't think there were fish on the ark. I don't think it would be playing the miracle card to think that the animals could have slept like a bear. But it would be a miracle for the animals to come to the ark and load up in the first place. It would take a miracle for the ark to not fall apart too.
The King James Version says the ark was 300 cubits long and fifty cubits wide. A Hebrew cubit was about 20
inches so that would be bigger than 450x75.
A cubit is a man's arm from his elbow to the finger tips. The bible says that there were giants in those days so a cubit may have been longer in Noah's day. An egiptian cubit was 20.6,but a mesopotamian cubit was 19.6 in. Even if it wasn't, that would be 300 x 20.6 = 6180in.
6180 divided by 12in. = 515 feet long
515long x 85.8 ft wide is 44,187 sq.ft. times three floors is 132,561sqft divided by 43,560 would be just over three acres.