I just made one similar to Jack's chain over the winter. Yes there are Y seams and lots of them. I laid the pieces out they way they should be in a block and started sewing them together. I learned to start and stop a Y seam 1/4 inch from the edge. If I sewed the seam to the edge, the blocks did not lay right and the seam pulled the blocks wrong. I also learned that with the triangle pieces, they are equal sides but 2 of the sides are on the bias. Always have the straight edge of the triangle on the outside edge of the block. This makes it much easier to sew the rows together. I will be happy to help you if I can with any tips I learned along the way. This is not an easy pattern but I love a challenge. I attached a picture of mine so you can maybe see how I did mine. You can not be in a hurry for this one. The pattern i used is called Rainbow of Rings.