See this Facebook post of mine.
Sorry, don't know any German so I wouldn't be of use.
If you're referring to the Sonntagsschul-Gesangbuch of the German Reformed Church (Hymn 1= Gott sei Dank durch alle Welt), I'd be interested in doing this. My father grew up in this church and this was his first hymnal. I'm familiar enough with German and with Fraktur, but this would be my first such project and I may need some guidance. Would you be allowing Hymnary to scan one of the two hymnals you have? The one I have is pretty fragile and has a few missing pages. Please let me know. Chris Wolter