How to build a fireplace using an existing chimney?
I would STRONGLY suggest finding a "fireplace format stove" you are kinda happy with and stopping right there. Retrofitting a masonry fireplace is a huge undertaking that generally has to start from below the basement floor.

I guess a prefabricated metal fireplace in a framed drywall box could possibly scratch the fireplace itch a bit more. Most of those are not compatible with having a second entry to the same flue, so if both the living room and kitchen enter the same flue, you'll have to address that.