Someone might want to let him know that while they hopefully won't be too trigger happy when it comes to suing a hobby project like this, the company that Commodore licensed the code in narrator.device from is AFAIK still around, and Commodore let that license lapse, so making use of it is legally shaky, unless he's talking about reimplementing them from scratch. Not to mention that he mentions AROS, and AROS doesn't have these available (or reimplementations) anyway.
He might be better off looking at something like espeak or Festival Lite anyway. Flite at least is a reasonably easy port. They're far bigger than narrator.device, but also sound massively better... Wanderer has also offered up (a closed source) port of his speech engine at some point.