I can tell you what I've been told by Joe who's managed to:
It's shitloads of work!
I talked to Joe of Joes' Bikeshop in Chiang Mai while I stayed there, ok repaired my bike there, and he's been into Vietnam with 3 or 4 friends with big bikes. He said it was a 3 month process to get everything done (maybe he said 4, not sure) You could contact him, he'll know all you need.
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