How to fill in a cavity, kind of a reverse-shell

I have an imported model that is a plastic part that is one piece. It is shelled, but I need to fill it all back in. I've tried using a sketch and extruding up to a face, but it can't quite do it. I tried using the shell feature to add thickness, but that also doesn't work.

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Could you please send me the model. i can do it and send it back to you.
Do you want to fill all the holes? can you tell me clearly?

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