Irrigation (Hunter SRC 600) with HA?

Hey guys,
Just a quick question, in case somebody has already gone through this and can provide some tips.
I already have this installed to control my garden irrigation.
Here is a picture of the actual thing:

Anyway, water is expensive so i need to do something about it, ie, integrate several controls with the
precipitation sensor or even be able to adjust zones on the fly according to what’s happening in my garden.

It looks pretty straightforward to me, get an 8-relay module, hook it up on a nodemcu and control the switches with mqtt.

Has any1 done something similar?
Are there any tips before i go start disconnecting stuff?
Any HA component to make use of or any nice piece of code a fellow HA’er can provide?

Thanks in advance,
K

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