Hi Dave,
Judging from the photos, that particular camera *should* have a proper ground glas, since the back seems to be complete. What you see on the back is actually cover/metal shade, and the GG should be under it - it's opened by pressing the tab on the bottom.... The GG should be under it, provided it's in one piece... OTOH, I think you can forget about the film pack adapter - someone correct me if I'm wrong, but I don't think you can find "film packs" for it any more...
You will also need appropriate film holders...
HTH,
Denis