Here you go. Just modded my (unused) Hassie polaroid back to attach to a 2x3 Century.
Attachment 60524
It almost covers all of the 3x4 instant film:
Attachment 60523
The bar at the bottom clearly is from the opening of the 2x3 pack film holder that I used to make the Franken holder. I bet it could be shaved off to make a more complete coverage :-)

