There's a script out there on
www.mapfact.net probably the german page you were talking about.
I've never tested it, but as far as I read the text what they basically do is to use the Resistance side and the civilian side, to simulate East or West.
What Killerdeamon did was to create an addon, which has all the normal OFP Units in it, just for the Resistance side (and Civilians I think)
-Fishion