This does not mean that God had forgotten about Noah and suddenly remembered him. The words "God remembered Noah" mean that God was now going to help Noah after the flood. Alternate translation: "God had not forgotten Noah" or "God thought of Noah" or "God decided to help Noah"
This refers to a very large box that would be able to float on water even in a very bad storm. See how you translated this in [Genesis 6:14](../06/14.md). Alternate translation: "a large boat" or "a ship" or "a barge"