Oh thank you all so much for wonderful comments - I have to admit when I making the sandwich I did wonder if I had bitten off too much.
I should have said "my 6600 and I" did it, because I bought this machine specifically to be able to do my own quilting - I think the 6600 is a great machine!
I dont think I could have done an "all over" fmq with the weight, but if you look, it is literally one block at a time. So once you have puddled the quilt around the quilting area - forget about the rest of it, just concentrate on one block at a time. I worked a quarter of the quilt from the middle at a time.
And yes I do "practise" alot, on scrap sandwiches, and pencil and paper too!