we've done it counterclockwise. I don't have a precise track log. We took mostly dirt roads and the tarmac only for liaison or to reach a city. The GPS often doesn't have those roads and we got lost quite a few times.

We are going in July with the 4WD and perhaps I'll load a bike on it but not sure. We'll be 4 people this time...
Because of the earthquake, we'll avoid most of the Sichuan. Don't know yet if we go Yunnan/Guizhou or QingHai. I'm tempted by QingHai but got only one month and this is far from Guangdong.