I do think it's important to have a shop manual.
My Zongshen ZS200GY-2 came with a service manual, and a parts manual.
I agree with Katoranger; I don't think the Zongshen RX3 is any more difficult to assemble than other bikes.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894