@roslof That looks awesome. I'm glad I could help and be part of it.

reserved/WIP (just in case),please proceed!

@Endprodukt
Retrieved my file (SVG vector format); unfortunately the parts outside those needed for the backdrop still need some finalizing. Anyway you can now download it from here.
Don't look at the preview it shows there, the cardboard does is complete.

@udb23 I'm just waiting on @caver01 sorting it out and the posting all the .art files here for me to use. Nah, I just found it extremely frustrating and the whole thing is not at all documented on the AdvMame site. I got as far as I could following guidance from caver but it still would not behave in a way I expected.

Maybe this will help:
https://retropie.org.uk/forum/topic/11797/what-s-your-all-time-favorite-game-for-each-system