Andrew seemed to post his design ideas and theories in various motorsport or engineering forums over the years. I first ran across him here and occasionally check back to see if he has posted anything new. He hasn't been active for a few years here or in other locations I have seen him post. So after a bit of digging I found some sad news (posted on his Facebook page). Andrzej "Andrew" Feliks passed away December 4th 2022. I always enjoyed reading his posts and will miss his enthusiasm for his designs.
https://www.facebook.com/andrzej.feliks/
Richard