You just need a pc floppy cable with 3 connector (1 connected to the A1200, 1 to the floppy disk drive, and the last one to the emulator.).
http://openbookconsulting.org/giip/hardware/images/floppy-ribbon-cable.jpg
Will this definitely work on an A1200? You can have your internal Drive as DF0: and the HxC as DF0? - If it does this would make life a lot easyer
Having the HxC as DF1 is pointless
There is some info on EAB about building a switch so you can connect the HxC to the external port and switch between DF0 & DF1
& Nice Case Retrofan and nice to see the updates Jeff
