Their Capital Wasteland mod was a project to bring the world and story of Fallout 3 into the engine of Fallout 4. Unfortunately, due to issues of using the Fallout 3 dialogue in the Fallout 4 mod, the project came to a grinding halt in March of 2018.
Source: N4G PC Can't Quit the Capital Wasteland Mod: Fallout 4 Mod Back in Development