This is not a chicken wing ! ^^Always a setback when come to SB a curvature profile on Gunpla , thinking of how to ensure the parts accuracy when mirrored left-right or front-rear, especially a 3D curvature profile.
So as for myself , pre-shape plaplate template as foundation still the best way for this matter.
Some examples of curvature profile scratch building from 1/48 Sinanju head Display .
A set of cut out 1mm plaplate . The small...