How long in feet was Noah's ark?

According to Dr. Max D. Younce, who says by his calculations from Genesis 6:15 that the ark was 450 feet long, 75 feet wide and 45 feet deep. He says this is equivalent to "522 standard stock cars or 8 freight trains of 65 cars each." By some divine calculation he figures that all the insect species and the worms could fit in 21 box cars. No divine calculations needed. The measurements are based on the cubit and there is some discussion over which cubit Noah used. The shortest ancient cubit was 445 millimetres which gives an ark of 433 feet. The longer Royal Cubit (the longest known ancient cubit) at 524 mm would give an ark of 488 feet.
Hope this helps.