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My suggestion would be to suppress or delete the solids and use the mid surfaces. Make the surfaces intersect/connect with no gaps by either adding surface bodies or using the "extend surface" command, or recreating certain components. After meshing, you can tell if surfaces are intersecting properly by showing the mesh, zooming in, and checking for shared nodes along the edges that you want to intersect. Typically surfaces don't connect on their own unless they share an edge, so you have to manually add split lines in the model to get them to intersect. Trimming one surface body with another also works. I prefer this method to using contacts as contacts take longer to analyze and are more difficult to visualize. However, depending on how many iterations you are expecting it may be quicker to use contacts.
Hope this helps,