These are great questions! Wish I had a better response for you but you might want to reach out the file manager who is handling your permit and ask what's the reason for some of these items, sometimes the counter clerks have a check list and end up sending the applicant ( you) that list without considering what you actually need. I am interested in seeing how this unfolds so hopefully we get some good responses from other members.
@Paolo Di Donato - you mentioned conversion to a duplex but there's room for 4 units. Are you intending to convert to 4plex or just a duplex?
#1 and #2 are bit strange. I've never heard of these before. You may want to call them again and ask them the requirements. If they repeat #1 and #2, ask for details.
i've only hear of a fire curtain being used in commercial buildings (usually near elevators)
I would call Andy Tran @ Suite Additions - he's an expert in duplex conversions. You can find him on his company Facebook page.