Well, I figured it out. I spent many hours trying many different things, but this turned out to be it.   Really wished that someone could have pointed me in the right direction, especially with so many current thread posts about the same thing on this forum.   As such, I hope that I might be able to help someone else by summarising my journey and how I got there. A full solution is below, but first, I highly recommend watching these 2 excellent videos from @SpaceInv