@tig said:

That'd make it the Bezier-surface-editor that ThomThom's working on ?
You could add a central 'spine' curve scaled/adjusted as desired and make the mesh in two halves that you recombine later on - erasing coplanar edges etc... To quickly make the spine-rail divide the profile into two equal parts and weld back, then use EEbyRailsToLattice > Rails only - then adjust the central spine-rail as desired and use that curve as a rail twice to make the two meshes you'll later combine....