Your failure to address a single one of the points I made, other than with a repeat of your original unevidenced assertion, is noted.
300 cubits by 50 cubits @ 21" per cubit * 3 decks = ~138,000 sq. ft.
@ 15 cubits high = ~ 3,620,000 cu. ft.
One railway stock car = 10 ft. x 40 ft x 15 ft. = 6000 cu ft.
The Ark had a cubic space equal to 600 stock cars. Stock cars come with at least two decks to carry animals (unless they are small like chickens. Only two of every animal are needed. A typical stock car holds 240 sheep. If a sheep is the size of the average animal onboard, there was space for around 70,000 pairs of animals. Considering that there are only a few thousands species of birds, for example, and all are smaller than sheep, it seems as though all land animals could be readily accomodated, along with food.