HO Scale Historical Ashlar Tunnel Portal System

/// QUICK SPECS /// Native Scale: HO (1:87) — Includes exact slicer percentages for O, S, N, and 28mm scaling below. Geometry: 100% Manifold, Watertight.The Deep-Solve Pipeline: Hours of custom historical research, manual optical reconstruction, and digital artifact restoration. Print Difficulty: Easy to Moderate (FDM prints the facades cleanly on their backs; Resin requires aggressive hollowing if printing the massive full-depth wedge). Carved from the bedrock to tame unforgiving mountainous t…

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