Thanks for the detailed post - FWIW, among other things, I’ve been a graphic designer for about 30 years, so I’m ok with editing. What it sounds like is that the panel is in front of the instruments, requiring an alpha channel to be applied to make the underlying instruments visible?
You’re referring to it as holes in the “background” image, but the way it’s described here, it sound like it’s a foreground image.
Please let me know if this is accurate… I’ll be trying the demo this weekend, but will also look at the Wiki - could you please advise which section of the Wiki covers the “layering” you mention?