When your doing your glue up, position the pieces with so you have clear peices in the middle :). Your right though, pine is full of knots. They run havaok on a chain mortise.
I'm not criticizing. Like I said, the piece turned out very good. It has has good glue joints, turned well, sanded well, and finished well. I like its look too. The shape is clean and how the knots break the clear spots.