I don't know how you feel on trying to replicate the look of the prototype Zip Drive, but if you got a cheap parts one from Ebay it might be pretty easy to do the recreation mod like a user here did back in the day. I had planned on that a while back, but now I already have a GDEMU clone, and an overclocked DC, with dual bios mod and the replaceable coin battery mod.
But there is a lot of visually good parts there to remake the prototype Zip drive as a faux one just to hide the parts in.
Here is the official prototype, only some 3 mockups were ever made, and afaik they were only mockups.
And here is one somebody replicated by gutting a Karaoke unit and a cheap PC Zip Drive. Please excuse the potato quality, I had to recover them from google thumbnails after originals were wiped from net. Imagine connecting a USB y-splitter to USB to Sata adapter to IDE adapter, wonder if it would be possible to make it easier to connect to the PC and ad games then? That way one doesn't have to constantly open it up to add them?
And his dual analog controller mod for good measure.