Yup, I've done the primatives bldg shapes, windows, doors, etc., in Google SU Free, then exported as PDF or DXF and imported that into Xara on its own layer. Arcs/Circles come in as faceted/segmented but at least you can get the true spective accurate and redraw the arcs/cirlcles using the SU segments as a guide. Note, you can also export from SU as JPEG or PNG with blackline on a white background style and then color over the top of it in Xara.