- three.js scene in the pier frame (pivot at first column centre) - coping as extruded elevation outline; columns, footings, piles, blinding, bearing blocks and pads - four view presets, per-part visibility toggles - workbook load (sample or file), result table, issue list and undetermined defaults - frame orientation test and bounding-box test Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>