Rod Walsh (from Geelong, Australia) has made seven model arks, and this is his latest:

Mr Walsh’s two metre ark  model is 72 times smaller than the real deal which he says was the length of three Olympic swimming pools, four storeys high – and large enough to carry about 130,000 animals over its three levels.

…As to the curly question of dinosaurs, Mr Walsh says the Bible talks about a ‘behemoth’ with a tail the size of  a cedar tree. He says he is sure there was a small dinosaur on the ark, along with ‘one of every kind’ of animal, but not every specie.
More at News Mail

That is an interesting take on the dinosaur question. According to Genesis:

Two of every kind of bird, of every kind of animal and of every kind of creature that moves along the ground will come to you to be kept alive.

Take with you seven of every kind of clean animal, a male and its mate, and two of every kind of unclean animal, a male and its mate, and also seven of every kind of bird, male and female, to keep their various kinds alive throughout the earth.