Bent surface with round corners - how to close it?

I wander which would be the best way to close a surface that is bent on two sides, with rounded corners? The bottom surface is almost like flipped top and rotated 90°. Edge of the bottom surface should match the top one (here is a picture).

Any suggestions?

Hello - see if the attached file helps.

WireCut_Maybe.3dm (105.1 KB)


You can just extrude closed curves then make a boolean intersection.

@hereiam is looking for both top and bottom to be curved surface.

Was thinking after making top and bottom surface to loft and connect.

Process is the same, just one step more.

Thank you all for suggested solutions - excellent. Much appreciated!!