Quantitative in-flight deformation data are required to validate coupled aero-structural models of soft-wing kites. This work presents an end-to-end measurement framework that combines stereoscopic photogrammetry with ultra-wideband (UWB) ranging on an instrumented Gamma-shaped bar to reconstruct large-scale wing deformations under operational conditions. Stereo marker tracking yields a 3D point cloud that is corrected using UWB-derived span information, enabling robust shape comparison across manoeuvres. Deformation states are quantified for depowering and turning and are compared against a commonly used undeformed CAD reference employed in aerodynamic analyses. The resulting dataset improves the quantitative characterisation of soft-wing deformation and provides validation input for aero-structural models, supporting improved kite design and providing a pathway towards deformation-aware monitoring and (near) real-time control.