Two issues with that:
1. The AGE of Joy cabinet file format does not support that type of bundling
2. Distributing the ROMs themselves is illegal under international copyright law, and I am pretty sure Itch.io would not allow it.
You might be able to find what you need by searching for the MAME 2003 reference set using a search engine like the one found at Archive.org.
Also, make sure the ROMs are in the "downloads" directory and not the "cabinets" directory. They should remain zipped.
If you still need help, you should check out Curfab's instructions on "How to get and deploy cabinets assets". He is the amazing programmer who wrote AGE of Joy.