Hi John, dear all, thanks for this tremendous achievement - just to let you know that I started working on MAME-only Artwork based on your bezels. They work out nicely - see also https://mameonmacs.blogspot.co.at/2017/02/porting-retropie-artwork-to-official.html
Update 15 February 2017: I now updated the Layout File in a way that you can switch between a Clear Screen (without scratches and reflections) and a Scatch Screen (with all the scratches and reflections). No Artwork duplication! Download Link updated. This is exiting!
DOWNLOAD LINK - any feedback on usage in MAME would be much appreciated!
PS: The combination of your Artwork with the Attract Mode frontend is simply spectacular 
Clear Screen:
Scratch Screen (posted in the reply - I am limited as a new user
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- still with the option to switch them away, which is just so easy to achieve in a MAME layout work. I will see whether I can make a note at Mr. Do’s Artworks, the official MAME repository, because your artwork is just that brilliant!