That's right, in fact that's what kindled my imagination in the first place. But in the remods posted above, the optical drive has been slotted above the original floppy drive slot. In order to make use of the original slot, you have to cut away sections of the internal frame and cobble up some secondary bracing. It seemed easier to me to simply invert the Mini, thereby placing the optical drive in a position that will fit.
What's also nice about this set-up is that every few years I can change out the Mini and replace it as it becomes obsolete, assuming of course that the basic form remains the same.