Another problem is that it would have to work with the Dreamcast's shape, and man is that a tough one. The other option is the serial port, but that wouldn't do much... If a Treamcast appeared, I'd buy it in a heartbeat if it isn't a crazy price.
I also don't have very good modding skills, especially when it comes to technology. There was a portable one that someone made that ran on 6 AA batteries. But I don't want to destroy a dreamcast for that. Would anyone happen to own a Treamcast? And if they did, what kind of price range would I be looking into if it is for sale? I just want it for on-the-go, but its not easy to come by, even if it was taken down by Sega very quick