Four exact J6 variants / R5 /25October2026
Checked development drafts,not construction/manufacture or NBS-ready approval. End/reveal-only supports,unconfirmed standing/sill datum and climbability,unverified aluminium/HAZ/weld/anchor resistance. Gravity movement sensitivity is partial and does not establish selfweight stress resistance.
Mass from nominal CAD volume with illustrative weld envelopes;excludes actual anchors,finish and packing.
Range schedule · All gaps · Official classification research