After having nailed the details, the one thing that continued to be in a state of flux was the actual size of the ship. The design was originally much the same size as the Enterprises that had gone before, but when it came to filming the shuttle approaching it or seeing it parked in a field in Iowa, the results were far from impressive.
"We had shots involving the shuttlebay which was portrayed as being a massive, multi-level space, which didn't fit into the ship at standard size. So the decision was made to almost double the scale, which seemed to make everything click with what everyone had already imagined."