My recipe for a great fireplace and chimney…
I’ve never worked from any special drawings when building a chimney or fireplace.
The inner workings (smoke shelves, flue liners, air intake, etc) on my projects are basically the same as those found in most modern masonry units.
The uniqueness of my chimneys and fireplaces that I build is all about the careful selection, shaping, and arrangement of the stone that composes the finished product… which I tend to model from other structures that I have admired over the years, mostly vintage.
With the vast sources of the internet I’m sure you can find some technical drawings, and then just come up with some photos of the fireplace that you most admire and copy it to perfection.