Some of the German buildings in TRS2006/009 have foundation sections which can be sunk into the ground thus avoiding too many little plateaus.
 
When I briefly dabbled with starting a French route, I discovered you can access France topographic maps online. (Link at home, sorry). These can be copied via screen dumps and pasted together in PSP, then georeferenced for the map overlay in Transdem. Not sure whether there's a France web mapping service or if so what the protocols are as this would ensure the most accurate match of map image to terrain. Having recently used the US WMS facility with Transdem I can vouch for what a powerful tool it is, but that is because the Help tutorial includes how to get it working. I would have been lost otherwise!