CATIA Wing Structure Modelling

Hello, I'm currently designing an RC aircraft in CATIA V5R19. I've created the wing, ribs,spars as surfaces. I want them in solid and when I execute thick surface command things get messy because of the tapered wing. For example, I'm giving thickness to the front spar and the new solid is partly intersecting with the wing skin and I cannot split them.
Thank you for your answers!

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I’d have to see the full model to give you a definite answer, but one option would be to use TheCADMans solution whereby you take the wing and seperate each surface and create a solid model from it. http://youtu.be/otO2LUGuNqQ
Another option would be to use offsets to close the surface.

 
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