As an experienced 3D artist, I bring significant skills to your project. I am extremely comfortable utilizing Maya and have a strong understanding of its latest features. I have previously worked with externally linked rigs and Arnold engine, which directly relate to your project requirements. I assure you that I can accurately meet the challenging aspects of your task, including the incorporation of external and internal textures, physics simulations, and exporting as .ass file (with all materials packed). Creativity and adaptability are embedded in my professional character and what else is needed in a role like this?
Furthermore, my existing library of assets may reduce the time frame needed for completion without hindering the quality. However, if you prefer something new, I assure you that it will be created while respecting copyright standards (if any). Moreover, my exposure to various 3D animation projects has equipped me with an expanded understanding of different industries; meaning our collaboration will not just end at executing the tasks you described but also infusing a relevant perspective into your project.
In essence, partnering with me guarantees creativity, professionalism, timeliness and most importantly, a product that resonates uniquely with YOUR vision. Let's work together and deliver an excellent final result!