What this study can establish

F / C / R identify front, current and rear passengers. Choosing 2–2, 3–3 or 2–3–2 loads the matching cabin-width reference. The center three use parallel yaw and a dedicated seat spacing; their foot lanes do not converge on the middle passenger. Outside banks face feet away from aisles. The aisle-side shell outline of each bank touches the light-yellow aisle buffer. Passenger envelopes crossing an aisle boundary are flagged and rejected by search. Foot links preserve the selected passenger owner; diagonal targets stay in the same seat bank. The four-sided trapezoid connects the rear hip width directly to the paired toe width with straight sides and slight display-only corner rounding. Knee checks remain independent of this simplified outline. It is a tapered plan guide, not a body surface. Hip, knee, shoulder and shoe checks retain their modeled heights. Their overhead projections may overlap without a physical collision when they occupy different heights.

The shell outline shows a full projection: an overlap is a trim candidate, not proof that the material collides in 3D. The section check samples the actual shell at six heights. The blue/red dashed row-entry traces show an empty-row, projected-shell passage screen based on entered body depth and allowance. They do not establish access past occupied neighbors or over fixed arms. A clear 2D body layout is a lower bound on required space; it is not a working aircraft seat, a comfort finding, an accessibility assessment or certification evidence.

Cabin width references and aisle-height minima follow the existing engineering model. Sidewall interpolation and mannequin dimensions remain explicit assumptions. Shoes are not shrunk or moved to match a pocket unless you change the stance controls. No footwell is represented by a filled box.