The dissemination of ancient architectural heritage is essential for the transmission of collective memory. This paper addresses the challenge of reconciling historical fidelity with immersive quality in virtual heritage reconstructions, using the Dougga VR project as a case study. We hypothesize that increased transparency in the documentation and validation of 3D reconstructions enhances users’ cognitive and perceptual immersion. To test this hypothesis, a hybrid methodology was implemented, combining Heritage Building Information Modeling (HBIM) with the COR16 evidence scale, precise 3D/archaeological comparison (Navisworks), Dynamo scripts for data structuring, and real-time user motion tracking via Mediapipe, complemented by eye-tracking, head movement analysis, respiration, and physiological indicators (GSR, HRV, fEMG). Authenticity analysis in Navisworks revealed ten major discrepancies between the 3D model and the actual site, resulting from unverified assumptions. To improve transparency, the COR16 evidence scale was applied in Revit and Dynamo to color-code certainty levels, clearly visualizing hypothetical elements within the VR model and enhancing its scientific rigor. Results demonstrate that this approach corrects major modeling inaccuracies, such as simplified topography or added undocumented architectural elements, while significantly reducing cognitive stress, showing that rigorous scientific accuracy can successfully coexist with an engaging immersive experience.