Thank you very much for your comment.
Your interpretation of the tokens is correct, you need to be at the source token to harvest it. I attempted to convey this through the resource chart. Originally, I just wanted to call them source tokens on the board, but ran out of space. The growth track is way to big. Maybe grouping resources and sources on the backside and naming them their could work. I tried to at least make them visually distinct, by making the sources gray, also marking them as not really your token.
The idea with the flip side I will definitely add. That's a great idea and you are right the ruins are fiddly.