Probably old news, but I've just stumbled across this Neo Geo AES repo board project, looks like a tidy solution
github.com
Anyone had a bash at it yet?
GitHub - Board-Folk/NeoGeoAES-3.5: NeoGeo AES 3.5 Schematics and PCB
NeoGeo AES 3.5 Schematics and PCB. Contribute to Board-Folk/NeoGeoAES-3.5 development by creating an account on GitHub.
Anyone had a bash at it yet?