Hi Michael, we have, I believe, a happy ending.

Following up on your last post I tried VW Preferences>3D>3D Conversion Res set to medium (was "very high") and it worked! I had no idea, and no mention in the manual, that it applied to IGES and SAT imports.

The ceiling isometric was a good test for MOI working with VW, ergo clear sailing from here.

Thanks for hanging in there with me on this.

Leonard