Perhaps you should team up with these people:
http://www.m17n.org/linux-
sh/dreamcast/index.en.html
The web site features screen shots of Debian
GNU/Linux running on a Dreamcast. One of the
Dreamcasts is even autographed by the Man
himself, Richard Stallman.
Check it out.
http://www.electronsrus.com/
page does not exist....
"There are initial plans for a Dreamcast expansion
device that will allow the use of network and IDE
devices. The project is here. If you have EE experience,
you might consider contacting them to lend a hand.".