Hi there Wesse,
I don’t have a direct workflow for you but I wanted to let you know that I have had issues in the past creating geometry in Rhino and having it work properly in Inventor/Nastran.
My purpose was to model complex connection 3D geometry and import in Inventor/Nastran for modelling and analysis. The issue was that once in Nastran at times closed filled polysurfaces would not import correctly as full solids. Or the holes I split into plates where not being recognised correctly as full bolt holes.
When I modeled the same in AutoCAD using Extrude and Subtract I had no issues. I prefer to use Rhino in general and this could be just lack of knowledge about polysurfaces and solids from my part but good to take a note of.