Marty,
I was checkig what the brazilian clubs were running when I found those images. It seems that the 1/28 scale based on Mini-Z Rc cars is popular in Brazil, Portugal, France and Holland.
– https://vortexsolucesdemarketing.blogspot.com/ (Portugal)
– https://guslotracing.blogspot.com/ (Brazil)
– https://sixpack24.blogspot.com/ (Holland) It seems Nick de Wachter raced/races with those guys.
I contacted TRP the same day I originally posted this … so far no reply. This is their website: https://www.technicalrp.com/catalog/.
I was able to find one store that sells RTR cars in Germany: https://www.slotcarservice.de/store/shop.php?mode=show_group&lang=de&group=78