Interior design - Architecture plans for a medical office

The project consists in making interior design/architecture plans/diagrams for a Medical Office / Medical SPA . Plans should be made using a classical software as they may need to be edited. (Visio, or a freeware software we can download , preferably for Windows®. The software should be able to export in various format for the house builder to import into his own files) The project should also include a Google Sketchup (freeware edition) import + 3D modeling All units are in meters/metric. You should suggest windows positions. I can choose the positions of the doors.