Hi all,
And thanks! Great to get it sorted. And impressive for so many to find the lineage right off the bat. From what I read in here I did a google and came upon a couple of guys in tamiyaclub who has or had one, and one of those seem to know his TAG cars. If interested you can read his take here - but I guess you have covered most of it in here already. Impressive indeed.
https://tamiyaclub.com/showroom_model.asp?cid=14703
At first I was a bit let down on it not being a more known model. Also, the body is clearly not the original. But it is a rather fun car to own and I have to try and get that crappy paint off it and see if I can't do better myself. And then to find a bumper...