Need Help - create solid face under stairs

[InspirationPoint]

Hello,

I am hoping someone can help me. I drew these stairs but I am having trouble create a solid face underneath them. The stairs curve upward and I would like the face to follow that. I will upload the sketch-up file. Thanks so much for your help and assistance!

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Stairs.skp

[pilou]

First clean your model there are too much different Group/Component intricated!
That Splatch Crash the program when we explode them!

And "Save as" V6 for a more large audience!

[InspirationPoint]

I have updated the sketchup file, hope that helps!

[Rich O Brien]

import this into your stairs file...

Stairs.skp

...your model is a bit of a mess.