Broadway Junction before 1940s?

I tried to model the NYCTA's Broadway Junction before 1940s? There is complex trackwork! Are there any track maps of the area? The latest "Tracks of NYC Subway" book isn't clear.

I did some digging around - here is what I could find:

This book has maps of the circa 1910 layout, after the Canarsie Elevated had been built but before it had been tied into the 14th St/Eastern District subway:
https://archive.org/details/combinepdf_201909/combinepdf/page/n33/mode/2up

These maps (scanned from an ERA Bulletin) cover the 1930s-era layout, after the Canarsie Line connection via the upper level platform at Broadway Jct had been completed, but before the Fulton St Elevated was abandoned:
https://tramway-null.blogspot.com/2013/12/source-linder-b.html

The Broadway Jct and Atlantic Av sections of this post have some more details on the exact of the timeline of infrastructure and service pattern changes:
https://secretsofthesubway.com/2020/08/19/l-bmt-canarsie-line/

Hope this helps!

How do I find out the radius of curved tracks on the real NYCTA subway system?

There's a website at nycsubway.org that have photos of stations.