Need advice joining complex surface

 From:  Anis
3593.1 
Hi....

Today I got iges file from my customer with so many disjoint surfaces.
I tried to join the surface to single solid body, but its not working. I also have turn on "join surface" under iges import.

Any can give me advice to get solid body from many disjoint surfaces ?
I will give you the file if you want to try.

Thanks !!!

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