BC Chinook Wawa is inspired by the example of the Kamloops Wawa newspaper that was published in the later part of the 1800s and the early 1900s. Using a type of French shorthand, the newspapers, letters and advertisements from those days constitute the largest body of Chinook Wawa writing.
The internationally recognized expert on Kamloops Wawa is linguist David Robertson. Visit his site at https://chinookjargon.com/
Robertson has studied this documentation for years and is a tremendous resource for many other aboriginal languages as well.
You can see an example of the Kamloops Wawa writing here:
This is the front page of the Kamloops Wawa newspaper from January 8, 1893, written in the script above. See if you can translate some of it!