I 'think' Mark is counting the grain striation on the inner reinforcement ring. He's just calling the grain striations 'plies,' anyone could make that error. The outside part/shell (lighter wood in photo) looks to be single-ply. The shot shows the scarf joint well and the shell appears to be one solid piece. I don't see any plies on the shell wood. If it is a solid shell (and it appears to be,) the drum is more valuable as an instrument even as a project drum.
I'm just guessing, but I think this is what we're seeing: - Please feel free to correct me if I'm the one seeing this wrong. Just trying to arrive at some consensus on what we're all seeing.
[IMG]http://i1143.photobucket.com/albums/n632/PurdieShuffle/leedy26bass00013_zps13becbb6.jpg[/IMG]
John