Looks good and I recognize the artwork used for that overlay. Guess an early version of the artwork file is out in the wild.

For the OP (or anyone interested). I teamed up with someone to use the artwork and direct print the art on PF so overlays wouldn't be needed. If interested reach out to them. Their info and the process is at the end of this thread - https://pinside.com/pinball/forum/topic/batman-de-pf

I also provided some scans of the main ramp in this thread as well. Hope that helps out a bit as well.