Ta da!

It's not quite finished. I need to join the 2 ends together to hold the circle together properly. It was a bridge too far for me today. It took me ages to get my head around how to link 2 cubes together and then I discovered that it was way easier to build each cube up from scratch, starting inside the cube before. Could have saved myself loads of time if I'd realised. There's probably lots of different ways of doing it but you always need to go with what makes sense to your own brain otherwise you can get in to a right kerfuffle!