SpaceX CEO Elon Musk was in Boca Chica, Texas over the weekend to oversee key construction activities in the assembly of the company’s newest Starship prototype. Musk will deliver an update on Starship, which will likely recap progress to date and provide a more detailed roadmap of SpaceX’s plans for the future of its next-generation spaceship and launch system. Musk shared photos of the prototype construction in progress, with the so-called “Mk1” prototype getting its rear moving fins, which are located on the bottom half of the rocket and which work together with fins located on the yet-to-be-installed top half of the spacecraft to control its stability during entry and landing. [gallery ids="1885055,1885056,1885057,1885058"] The Starship Mk1 prototype will be the first to represent the final vehicle in its orbital-class configuration, after a ‘Starhopper’ prototype SpaceX produced initially accomplished the goal of testing one of the new Raptor engines and demonstrating low-altitude flight, control and landing capabilities.