Cool - thanks for the reply! I think I have the basics down - it’s a very easy system out of the gate to get rolling! I added the variables and my own door system - no problem 
it’s when I tried to make the key object that I had problems - I could initially pick up the key, but when I overrode the functions then I could no longer pick up the key - I figured calling the OnActorUsed from the parent was enough to keep what functionality was already there and I’d just extend it - am I thinking about that wrong?
Thanks!
Jamie