I use Thangles to do speedy HST's - cut your strips of each fabric the length you need to do four HST's of each of the fabrics plus an equal number of strips for the background. You can still chain piece using Thangles. Going to be a pretty quilt - but be sure the end block on the right edge of row four is turn around correctly before you sew it in to the row. Your diagram has that block turned in the wrong direction - which made the "ladder" extra long. Looking forward to seeing the finished quilt. Do enjoy those fall colors.