I read your amazing solution in this topic Is it possible to connect to ArcSDE using QGIS?. Unfortunately I'm not so expert in open-source products (we use only Esri suite) and I need to ask you some things. - How can I create a .ovr file with my SDE connection? - How can I add it to QGIS?
I followed Quantum GIS Desktop - Connecting to ArcSDE databases - QGIS Issue Tracking and Quantum GIS Forum: ogr/gdal plugins for ArcSDE and I got data out of SDE into QGIS using a .vrt file.