I gotta give you a humungous thumbs up for all that you are doing for this cat.
I have done the same thing with a 4 week old kitten I found, that came right up to me in the middle of a road by my moms. I picked him up and held him close til animal control arrived (boy did that break my heart when he left, but lucky for me I volunteer where he was taken to).
Hes now a healthy (and rambuncious) 3 year old that lives with my GFs aunt, along with another cat around his age.
the cat that we had gotten when my cat died, is now a healthy, rambuncious 5 year old, after he adopted us when he got abandoned.
saving lives.......one at a time 24/7/365