By the way, if anybody wanted to make a mock-up Zip Drive addon for the Dreamcast, you could purchase a broken karaoke addon, and gut it, and put a real zip drive inside it as the zip drives fit inside of the slot where the control panel for the karaoke unit were. In fact an old member here by the name of Spinksy made one back a decade ago here.
Sorry for the low quality, I didn't have the foresight to save it when it was still available full quality, I had to steal it from Google thumbnails, but here is all we got.
He gutted the Zip drive too. My idea was to use this with the IDE HDD mod and stick it inside the thing. But now there are bettter solutions, such as the widely available GDEMU which I have now.
But if you ever wanted to make one, I believe the zip drive he used was an old Panasonic one for the PC. That fit exactly in the space that the karaoke unit took up, leading me to believe the shell was meant to be used for both devices and happened to be made to fit both of them. All they had to do was build to scale of the zip drive, and make the karaoke bits fit into the same space, which they did.
You can see he even added the USB looking slot on the side the official prototype had. I used to want to have a Y splitter USB cable inside a modded unity like that connected to a HDD for quick access for putting games on it.
As you can see, a zip drive is the same width as the inside control panel section of the karaoke unit.
Iomega did say the Dreamcast Zip Drive was exactly the same as a PC one internally with only a few "tweaks".