After multiple revisions and restarts, I've finally finished a releaseable version of this mod. 
This was based off the discussion on the original Animatronics Apocalypse mod, which doesn't run on my build of Fallout 4 likely because I have other cell-overriding mods installed. As a result, I decided to make this as a standalone that only requires the assets, but not the ESP of Animatronic Apocalypse.

As the body parts are built off of CBBE, you can make Chica and Roxanne as curvy or as petite as you want. Currently, they are set to simply vanilla shapes.

They are based on Gen 1 Synths, which is why they will bear that endoskeleton instead of the expected FNAF endo version. I don't currently have a working endo that replaces that currently. This could change in the future.

Roxy and Chica are currently suitably grungy!