Oh, and I know this isn’t the official way of doing it, but there’s an easier alternative to the monitor solution for a Dreamcast cab. If you find an empty cab, depending on the cab, bolting in a television’s guts may be very, very easy. All that’s entailed is gutting the television and setting the screen/tube in place. My friend is working on a custom NES cab, and he opted to do this. As the television is already ideal to display the NES at its native resolution, it was a real no-brainer. If you’re satisfied with the way your Dreamcast displays on a teleivision, this might be a viable option for you.
That’s if you find an empty cab, or one with a burnt out/ busted monitor. Then, you can just mount the Dreamcast (again, gutted) to the inside of the cab, and come up with some creative wiring solutions for “real” cab functions.
What the others say is true: once you’ve worked with a cab for a bit, you’ll realize that there’s actually a lot less involved than you may imagine- or perhaps more, I suppose. After owning my Neo Geo for only 2 weeks now, I’m considering picking up an empty cab in order to make a PS2 standup.