Fabricators' Construct was an attempt at rewriting the mod [Tinkers' Construct] for Fabric Mod Loader, managed by halotroop.
Caroline was the main developer, and unfortunately got caught up in small details too much to make any progress on the mod. She was mainly focused on the registry system, which would have handled the creation of many, many items that could be crafted in the mod.
There were also many complex systems in the mod that would have taken a long time to port over. But Caroline was not confident enough to complete them.
You can view the source code HERE.