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Hello, NEST is not compatible with all configurations, yours has been using non standard colors, and wiring.... If I help you its going to take over an hour to sort those circuits out, and that is not covered by your offer.
So I will opt out and we can see if any of our other experts want to get involved with the situation.
Or if you wish, after a time, you can ask me to post a premium service offer which includes quite a bit of engineering....and I will submit one.
I am a different expert. I will be happy to assist you today. Can you give me model on old thermostat and tell me what color wire went where?