Hi Bill, my first suggestion is that you should ask them if they can take STEP format instead of only IGES.

STEP format maintains all the connection information in the file, so it will tend to have less work to do on the receiving side as far as figuring out how the solid is supposed to be formed.

With IGES format all the surfaces are basically just individual separate pieces in the file, so the receiving application needs to do more work for figuring out how they all join together, and that's particularly difficult if there is more than one part in the file with the parts touching each other in some spots.

I haven't checked out your specific files yet, that's just general purpose advice.

- Michael