I do not think I am qualified for that yet, as I am just started trying to learn FreeCad and also only installed the essential StepUp tool, not the other routines. As I am on Windows I have no idea where files are going if you are using a Linux flavor etc.
It is essential to state that the KiCad Stepup tool actually is installed for FreeCad and will import footprints, align 3D model to footprints, export STEP and WRL models and reimport freecad PCB files and allow creation of STEP models of the Pcbnew file, all from the same Stepup tool within FreeCad. (It was the latter part that I missed to begin with and was looking for a file/script that would install in KiCad).
With windows 7 only the kicad-StepUp-tools.FCMacro file is needed and copied into the ...\AppData\Roaming\FreeCAD\Macro folder under the user's home folder. Also I copied the kicad-StepUp-icon.png and kicadStepUp-starter-Guide.pdf to the same folder although strictly not needed. I used the icon for a toolbar shortcut. The manual for KiCad Stepup provides a link to the description on how to do that.
I have not even begun to look at the scripting stuff, so that is still a mystery to me.
It seems to me that FreeCad is a lot more developed than the version no. would indicate, it is already quite impressive. Against advice on the FreeCad help pages I went straight for the devloper version, 0.17. Although documentation is for ver. 0.16, some of the routines for positioning and rotating objects seem to have been radically improved, although sometimes a bit glitchy. There is also much more structure in tre-view/combo view under ver. 0.17. No need to learn old routines just to soon have to relearn it.
Regarding the theme of this thread, as I understand only the nightlies will download the STEP files to a local store. I found a lot, but it is a bit unclear to me how much of the models are now in the official repository, and how much one would need to download from separate githubs/links earlier in this thread?