Continuous surface with sharp edge in MoI only - Possible?

 From:  tuananhnp
10865.1 
Hello Michael and everybody,

I'm working on this particular problem of surface continuity. And I think I'm pretty close to achieving a continuous surface with MoI only. There are obviously some things missing with the outcome that I cannot figure out yet.


Here I started with 4 curves:




Network and Sweep produces 2 different results. Both are not continuous, I guess due to the sharp curve on top:




With the Network result, I extracted the middle curve:




I lofted the 2 side curves with the middle one. With the top edge of the lofted surface, I did Network with the same side edges, and the original bottom one:




I trimmed this networked surface with the original top sharp curve, to retain the profile shape:




The final surface is continuous, but 2 problems remains: The top edges are wavy, which deviates quite much from the original straight edges; And it's a trimmed surface, so isocurves are not natural:





I'm wondering what can be done to retain both the profile shape and the top straight edges. I believe this could be solved more deftly, but for now I'm kind of stuck. Maybe someone could shed a light on this.

EDITED: 28 Sep 2022 by TUANANHNP