My approach to your project is to ensure that the design of the watch remains consistent despite the adjustments required to fit in commonly used parts. I have a strong background in design and engineering, and my skill set is well-suited to this kind of project. My experience includes designing parts for watches as well as creating 3D models of watches for CAD/CAM systems. I also have experience working with sapphire crystals, movement holders, crowns, o-rings, gaskets, and screws, so I am confident that I can adjust the design to fit those parts without altering the look. Additionally, I am well-versed in ensuring that the watch size remains the same, as specified. With my expertise, I am confident that I can complete your project to your satisfaction.