My understanding is that if it has never been registered your bill of sale and a tracing of the hull number (like with the side of a pencil and a white piece of paper) are all you need to get a title. Some counties are easier than others so it depends on where you live. You may need to have it inspected by game warden to verify the numbers.

Fayette county can be a sticker for detail. I recently made 3 trips to transfer one until I got all the i dotted.