Ian, if you do succeed in fabricating the 9X12 sheaths, what are the chances of making a few 10x15cm? I have six double sided plate holders for my Toska 550 but have only been able to find three film sheaths (courtesy of Ole) in three years of sporadic looking. Unfortunately I am not very handy at any kind of fabrication. In addition, I am now the proud owner of an Ica Ideal 525 (10x15cm) but do not have any holders for it. I wonder how many years it will take to find those.