Thanks so much for managing these resource files!!!
A couple things...
1. Inside the dat file for "Unofficial Alternate Artwork" it lists "Official Other" as the description. This should be changed to "Unofficial Alternate".
2. The Mega.co.nz link to the Unofficial Alterernate set won't download (even with an account).
3. The link to "Full 0.167 MAME Alternate Artwork" points to the "Official Other" file.
4. Could you post updated .167 MESS Home Devices and CABDEVS dat files?