Actually, I should have thought a bit more carefully about question 4 - the bits I struggled with most were the bits in German; I could get the gist of some of them but not others, and didn't look them up.
6: How do you think the title reflects on the book? What is its meaning
The book refers to a quote in The Bible, "through a glass darkly", which I think refers to humans not perceiving the world entirely accurately; I think it may refer to the confused thinking of Fred/Arctor watching what was recorded through the scanners fitted in the house.
7: What did you make of the unreliability of Arctor/Fred as a "narrator" (in the sense of, how did you view his experience as being worthwhile)
I felt his unreliability added to the way the reader saw his mind unravelling as the book went on.
8: Do you feel that the ending was at all redemptive, or did you see it as unremittingly bleak? And, either way, why is that?
I felt that the ending gave some hope for Arctor's recovery, as he did recognise the small blue flowers, which made me think that he could recover slightly.
9: How does the book relate to your experience with drugs/druggies?
I certainly know people whose lives and health have been totally ruined by drug addiction, but I also know people who have totally turned their lives around and are now successful after living lives very similar to those depicted in the book when they were younger.