- Multi-column coping (2·3주형): underside between columns drops 300 below Level with 300 × 300 haunches (spec §4.5, Q3 추천안). - Steel pipe pile diameter 609.6 mm (spec §4.5, Q5 추천안). - Direct foundation keeps the 100 mm blinding concrete (Q4 추천안, test added). - W03: bearing centre closer than half a block width to a step boundary. - W04: block footprint outside the coping plan. Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>