Isn't the wet mounting attachment 8x10? Can't you lay the film in that?
I'll have to check when I get home but I could have sworn it was the same size as the film area guide.
And I use that wet mount all the time to scan off size film I don't have a holder for like 127 or 70mm/116
If the film is curly I lay ANR glass on top to keep it flat.
You wouldn't need the ANR for sheet film so you wouldn't have to worry about newton rings because there wouldn't be enough pressure against the glass to cause them (in my experience they only show up when you really press hard with that holder.
Am I totally off base here?
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