I'd just recommend three things...
1. If you're building it in Calgary, make sure you're permits are good to go unless you want to be a rebel and chance it.
2. Have drainage on the earth side of the wall or ensure the wall is permeable.
3. Either build it right, so it's doesn't lean, or have mechanism to straighten it (if it starts to lean, you'll likely need to remove dirt prior to straightening it), like so:
