There may be some obstacles (like visas) in the Stans, but I believe the biggest problem would be the official requirements for crossing the entire width of China from west to southeast. That´s going to cost a huge amount of money on the arrangements alone. It is prohibitively expensive for most people.
It seems that some people have sneaked in without a guide, but those reports are a few years old now, I wouldnt build my plans on that. Especially if/when you want to travel through the whole country.
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