In this session geared for intermediate and advanced OER users, we will share the three phases of a project to replicate and sustain an externally hosted, highly interactive, and simulations-rich OER textbook: our motivation to embark on the Pressbooks project, the process of replicating the interactive components and simulations using H5P and GitHub Pages respectively, and the realization of the possibilities for greater OER and Open Pedagogy practice once the project was built out. In addition to greeting participants with a poll on their reliance on externally hosted OER, we will ask participants to share their experiences and contribute to our growing checklist for OER sustainability: a collaborative tool we can all use to identify OER that benefits from local hosting, to promote best practices as OER are replicated and reshared, and to identify open practice and open pedagogy opportunities of replicated OER. We will, of course, encourage participants to adapt or adopt our version of the textbook, now that we’ve ensured that the text, interactive components, and simulations are now fully replicable and adaptable for all.