No, that's not C-3PO. Rather, that's a papercraft of K-3PO, the protocol droid stationed at Echo Base's command center in Hoth.
Link | The plan [PDF] at Blog@Papercraft [in Japanese]
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http://echandola.com PDF size 19Mb.
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K-3PO was a lieutenant and coordinator for all the droids in Alliance High Command. In Empire, C-3PO attempts to talk to him and is blown off, prompting C-3PO to refer to K as an "officious dullard."
Also, I would have been awesome if whoever made this included the big unrepaired hole K-3PO had in his chest.