>>23336626
The Nemo being based on the Mk-II's movable frame is a retcon from databooks. The staff didn't originally intend it. It was just going to be a GM II upgrade. The ANT movies compresses the events so much that we see the Nemo right after the first major battle where Kamille's father dies in the movie, before they even have a chance to study the Mk-IIs, so Tomino didn't care about that lore.