Element 120 remains experimentally unobserved, but its nuclear behavior can be investigated through external data-compatibility analysis. This article presents a model-based Element 120 discovery framework centered on the predicted high-stability region Z = 120, N = 184, A = 304. The framework was tested against AME2020 atomic mass systematics and NUBASE2020 nuclear-property evaluation, using local superheavy mass-surface extrapolation and a semi-empirical mass-formula baseline corrected by endpoint residuals. A total of 260 AME2020 superheavy entries with Z >= 100 were parsed and analyzed. Across nine independent extrapolation variants, the predicted binding energy per nucleon for 304120 clustered at 7027.18 +/- 4.53 keV/nucleon, with a range of 7019.90 to 7033.70 keV/nucleon. This convergence indicates external compatibility of the proposed Z = 120, N = 184 nuclear framework with known superheavy mass trends. The result is not an observational synthesis or direct detection of Element 120; rather, it supports a data-compatible, model-based theoretical discovery framework for the Element 120 region. Originality and AI-use statement: This work is an original research output by Begüm Yıldırım. AI tools, if used, were limited to language refinement, grammar correction, formatting, translation assistance, and clarity improvement. The conceptual framework, research direction, interpretation, models, and conclusions belong to the author. External sources, datasets, or prior works are cited where applicable.