The kitchen pretty much designed itself I think. There aren't a lot of options for placement. The pantry door kind of dictates that.
I suspect the turret is the space you're envisioning for your writers nook. I've turned that into a bathroom.
However, now I' having other ideas for that space. I'm thinking instead of using those for bedrooms, I'd create a family room and study. But family rooms weren't a thing back then, though. I'm conflicted but since I'm trying to keep it with a vintage feeling, I'll let it be for the moment.
I might build a duplicate somewhere else and make it more modern. It wasn't uncommon in those days to have houses repeated. There were only so many designers and builders.
It's too early to be making rational decisions. Last night was one of my broken sleep nights so I'm only just getting mobile and not very quickly at that.