virtually same thing happened to me. I emailed a seller to ask few things about the bike and never got a reply. I put a bid in anyways and won.
Checked messages after winning and as well as the info i asked for he stated that it may be sold on another site dependant on what it reaches on ebay...
yeah should be a straight forward job mate. Just make sure you get the upper crown with the fork. The lower will be pot rivetted to the steerer on a jake