nicely done

Sushi reverse applique is where your appliqued piece is under your background instead of on top, you fold the edges of the background back and sew it to the applique piece.

I don't know if this will make sense but I sewed the square to the trapezoid but stopped 1/4 inch from each edge. Then I sewed those sets to the octagon, doing the same stopping 1/4 inch from each edge. That allowed me to fold each edge that touches the diamond to be folded back on what would have been the sew line. Then I placed an oversized piece behind the diamond shaped hole and top stitched it in place.

You are very inventive. I have no desire to do Y seams.

looking good

"The end justifies the means" certainly applies here. :thumbup:

They look great!!!

Great blocks...even if you had to use the back door. : )

Great job, they look great.

very nice!!!

Your blocks are nice, great job lining up those stripes!
Y seams are not difficult. Preparation is the key. Using a ruler place a dot at the 1/4" spots at each corner. when sewing the first two pieces together stop exactly on the Dot. Then when you add the third piece start by lining up/ matching the dot on the new piece with the dot on the second piece and pin, sew the seam, stop at the dot, then you can stitch the final seam again pining at the matching dots. All done :)