The description of the building of Noahs Ark:
Make yourself an ark of gopher wood; make rooms in the ark, and cover it inside and out with pitch. This is how you are to make it: the length of the ark three hundred cubits, its breadth fifty cubits, and its height thirty cubits. Make a roof for the ark, and finish it to a cubit above; and set the door of the ark in its side; make it with lower, second, and third decks.
The description of the building of the Ark of the Covenant:
*They shall make an ark of acacia wood; two cubits and a half shall be its length, a cubit and a half its breadth, and a cubit and a half its height. And you shall overlay it with pure gold, within and without shall you overlay it, and you shall make upon it a molding of gold round about. …Then you shall make a mercy seat of pure gold; two cubits and a half shall be its length, and a cubit and a half its breadth. And you shall make two cherubim of gold; of hammered work shall you make them, on the two ends of the mercy seat. *
The bible seems to be describing both in similar terms. How can someone take one literal while insist that the other is a metaphor? Personally i think both are literal.