So no internal details needed.
I guess I would use the CAD file as a reference and redraw from scratch. There are excessive numbers of segments on many of the curves in the import and they will not add anything useful to the model. As I suggested, for the cones, you can use Curviloft to create the surfaces.
Since this is going to be used as entourage in your studio model, resist the urge to go crazy with the small details that won't be seen anyway.