This is a shot to show how the final mounted piece will nore or less look. The thing is so HUGE that it needs two A1 sheets of card, although obviously when finally done, the border around it will not be so wide as it appears now.
I wonder if the width of the blue material still needs to be reduced a little, maybe an inch all round?
Here is a close up of some additional stitches addes to link the pieces together. They are 'escaping' from the piece on the right, or disintegrating from it.
To the right some more escpaed stitches between the other two pieces, and some detail of the stitches attaching the main pieces to the backing fabric.