Cecilia tutorial is available now at https://www.etsy.com/shop/
The standard version used 10/0 delica, but you can also use 11/0. The left bracelet with blue and green, I made with 11/0 and it was very easy to get clustered. :D
This is standard version with 10/0 delica.
This is with 11/0 delica.
The pattern is available at my shop. Here the sample page.