@Deus scientiarum the answer to your question lies in the solution to 5a! If you’re having trouble actually making the …, don’t use black and white squares – just use any two letters with the same height and width, it’s good enough if you can look objectively.
As for Joan’s clues, beautiful and strong is actually super useful if you look at it right. Weird, I don’t know of a cipher called the “BeautifulStrong” though…