Have you seen Ikuo's Stars and Stripes recolour of his Canon Bald eagle?
https://www.youtube.com/watch?v=_0dW0oe3I8A Pretty sure the DL link is mentioned in the video. Correction ... click on SHOW MORE in first comment.
I have downloaded it, but my fingers will need to improve a bit more before I attempt it. It's pretty effective at design (A4) size, but can you imagine it doubled up to (A3) almost life size?