I believe that maybe the best for fill something between 2 arcs (or any curves) or more in the 3D space is
Curviloft by Fredo6 (first tool: loft junction ) π
Call the tool, click arc1, arc 2, arc n , Enter that's all
(curve 1, curve 2, curve n)
And you will have a bunch of post parameters: Increase or decrease number of facets etc...
Have fun curvilofting! β
(click image for zoom π
Curvi.jpg