I am adding on to make this bigger. At the point of the motif’s I did another set of repeats as follows

R46 purple
R47 black
R48 blue
R49 black
R50 green
R51 black
R52 yellow
R53 black
R54 orange
R55 black

That brings the corners to 15 sets of 3dc

I then did the motifs as

R1-2 red
R4-5 black doing the join as you go to match with the black.

I then did what was originally R46-51 in the reverse rainbow to keep with the theme