I'm relaunching the subject, is there a way to generate an IFC file from solidworks by having a correct IFC file output because for the moment I'm missing half of my model.
To export to a DWG_3D, try using ACSI (*.sat) (without going beyond format 10 in the export options). Then import this format from autocad/dwgeditor or draftsight... and save it in DWG(3D).