A theoretical cosmological model describing the universe as a finite thin-shell (bubble) spacetime with a static interior geometry. Global evolution is encoded in boundary dynamics governed by the Israel junction conditions, rather than interior metric expansion. The work focuses on background geometry and observational relations within classical general relativity. Attrubiton Notice: This work is the original intellectual property of Michael Aaron Cody. All ideas, arguments, frameworks, and conclusions are solely the author's own. Unauthorized reproduction, paraphrasing, or use of this material without proper citation is prohibited. If you reference, quote, or build upon this work, cite it. Follow me on X: https://x.com/MichaelCody