I just thought I would share that I successfully connect and use this drive now. It was super easy but I have not tried 250M disks just my old 100M but both Amiga format and PC.
A friend of mine gave me a 250M USB Zip drive. I got that working in snap.
Amiga format
Change the device on the "zip" device driver in storage/dosdriver from the siiide.device to usbsys.device and unit to zero on the Icon information.
PC 100 Format
Changed ZIC device driver making the same changes to it.
One thing I have ran into is that with the Zip driver I can read Amiga format no problem but if I insert a PC formatted disk it will read it but not read Amiga format until I reboot. Any ideas?