In what should probably come as a surprise to nobody, I made an error in my translation of the original German report. The carrying lugs attach “…at about one-third of the height… (…auf etwa einem Drittel der Höhe…)”. I’d taken that as the full height of the quiver and put them at 20cm/8″ down. They should be at one-third of the height of that front panel at 16cm/6.3″ from the top.
I’ll correct the first post when I get a chance.