This has probably been covered somewhere in the past, but given my abysmal search skills I have not been able to find it. So here goes:

Every now and then a plane comes up on Barnstormers or one of the other sites that appears to be complete but has no build documentation, no N number, no logs. Is there any way to get an airworthiness certificate on it, perhaps by dismantling it to where you have 51% of the tasks to accomplish and then document the rebuild? Or has it become a really big paperweight?

Just curious, and of course enquiring minds and all that... Thanks.

Tom