Help with creating an underside skin for stairs

I have built some stairs, however when I try to use Curviloft to create a skin for the underside of the stairs, it reads as an error and when I extract the line work from the plan to use Curvishear, the linework works with Curviloft, but doesn’t sit correctly on the underside of the stairs. I am also not an expert with stairs and maybe I have drawn them incorrectly? Any suggestions would be greatly appreciated. I have attached the skp file too. Many thanks :slight_smile:

Stairs_.skp (168.8 KB)

Try something like this (Fredo Spline and Fredo Curviloft)

Thanks very much. I’ll give that a go :slight_smile:

Just use Sketchups Sandbox, ‘from contours’ if you can’t get anything else to work.

Hello,

I think soap Bubble will be better for that

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Thanks so much for your suggestion. Such a simple solution, I should have thought of that one :). Appreciate your help!