Quilters Cache is a great resource for quilt pattern.
This one is for PPing, but you can take the PP patterns, and measure your sizes.
https://www.quilterscache.com/S/StormAtSeaBlock.html
That being said ... I know you said you didn't want to do PPing, but are you really sure?
Believe me, it's a lovely pattern, but oh so much easier when you do it via PPing.
You'll truly enjoy the end result of all those pointy points and perfect matching.