BLACK CQ - the countdown begins!!

I have exactly 28 days to get this quilt done!! I don't know what to say apart form that, except that thanks god it doesn't need quilting!! I am going to (intend to) use the"invisible"tie method of holding it all together. Valerie Bothell showed this on her blog a while ago (sidebar). Ingenious.

The pictures are not all great, sorry. Below is block #19 completed.Block #20 almost completed.
... and, taa-daa, all the blocks together. This pic is taken from the foot of the bed. I couldn't get all the blocks in. I have played with the layout a little. I think there are too many big chunks of lightness on the left side.
Here is the quilt in it's entirety. I wish I hadn't put the blocks of colour in it now, but hey, it's done, and it's not changing!!
I still have no clue what I will do once the blocks are pieced. I had though some stitching in the black diamonds where the corners meet. Now I am thinking maybe a uniform stitch along all the seam lines, probably feather stitch. I would use the sassa lynne threads, but in no particular order, though probably stick with lighter shades. Once everything is pieced together I will show you again


edited to add: I have a month to finish the quilt before the hand in date for the Auckland Patchwork and Quilters Guild annual show. My nana made a comment last year about us all exhibiting together, so That was my goal for this year, to have a quilt to show.