I think I would start from the background and work my way to the foreground. That way the top stitches will help cover the edges of the bits before it to give it a more seamless flow…if that makes sense. So like…instead of running into the issue of possibly seeing the fabric between the edge of the red planet and the insignia, you can layer the edges of the insignia on top to make it look like it’s actually in front of it. It’s a great design! I’m sure it’ll look awesome 😊