Alby,
I thought somebody here who knows Apache will post photos you need right away but still no answers))))) I'll make a try.
I don't have photos of back wall itself. I looked through the web and here is what I've found - thought it might be helpfull for you.
Aires cockpit for Hasegawa kit is the best in 1/48 scale. Heres the link where you can see detail photos of how they made the back wall))))
http://www.modellversium.de/kit/artikel.php?id=83&origin=cat
Also there are couple of "colleteral" photos where you can see through the canopy some detail)))
And here is the link to Apache Technical Manuals (very helpfull)
http://www.tpub.com/content/ahapache/
Hope this helps))))
Andy