Regarding what is available, I believe the repo is closed due to licensing BS.
And you are spot on. The code is still there, of course, but it never got finished.
Given that 2016 makes base developing harder, I guess it will need a severe overhaul to get it up to speed. I don't have much time (or interest) to do that, and given the licensing BS, I have also lost my mojo regarding Orbiter addons. Perhaps it'll come along my way again while investing time in tools like OT3 and OMP.
After all, the first WIA was THE home base for OMP, so chances are that the successor to it will be AU, once I can get that dreaded mesh slicer to run in order to convert 3D meshes to 2D heightmaps
If somebody absolutely, totally, 100% NEEDS that base, I can certainly dig up some release binaries of it and give it to that person. But I doubt that's the case.