Actually, I managed to sew the cushion pieces together yesterday so I am top stitching the seams at the moment.
Rather than using a fancy stitch I am straight sewing with a double needle.
The whole thing is coming along nicely - so far - without much of a plan at all. I just know that I hope to make a small border all round the edges using bias binding but other than that I've no idea what else I may do. Bit of fun.