When exporting to DWG, no option seems to work for me in order to generate layouts in meters, instead of milimeters. Tried units, all translators...
So what here (already in autocad) measures as 1051 units, should measure as 1,051 units (A1+):
It is strange, since the layout is in meters in Archicad:
Also notice that the exported paperspace is correct, in meters.