Hi!
Never say never! I`ve been on the same quest for a long time with similar dissapointing results, but maybe by combining efforts we can get somewhere! Try these:
They may be not cheap, but as far as I see the hull is the same, and the grafics pointed by Francis provide excellent deck arrangementes. Maybe we can fill in the details with some educated guesses.
Some time ago I also found the Bundesarchiv Koblenz have a website and a few pictures uploaded. Follow this link and browse the 42 pages, I recall having seen one or two pics of fahrprahms (not artillerträger, though) which may be of some help.
Cheers, maybe I´ll dig out my old project too!!