Man, you're doing gods work here, I've been reading the forum for years, but never posted anything and even joined been like a month. This time i knew that i needed to say something. What you're doing is one of the coolest projects I've ever seen regarding video games. I cannot thank you enough, not just for converting and making these amazing games available, but to showing the community that it is possible.
Are you planning to document and share this is done and how these games work? I'd love to read more details about it and play around with this. I have some experience with SNES and Genesis rom hacking and hardware development, but never read much about the Dreamcast, would love to try if you're willing to share!