This Work-In-Progress is completed and the mod can be downloaded!
Bad news:
I give up!!! Tried multiple times, with different approaches, even using AI, but I can't seem to change the growth calendar for orchards. Either will show weird months for harvest, either won't grow at all. So all trees and buches will stay the same as olives and grapes - base game. I really wished I will find a way! But enough is enough, I lost in the struggle about 10 hours in several sessions, so it is just a mod, not worth my sanity.
Good news:
Following the addition of new animals, added them to the slaughterhouse. Geese processing will give poultry meat, feathers and animal fat (feathers from chickens too). Rabbit processing will give rabbit meat and rabbit fur.
Regarding new fruits, I added a new production: Jam Factory with 13 types of jams.
Daily updates on my Discord. Link in bio.
So, first of all, thanks to Taz Polycount, the berry bushes are now smaller and harvestable with all three modified harvesters, New Holland 9090X, Oxbo and Jacto k3500 (and of course that new one from honved, here on Kingmods).
Second, I got permission from Wingi to add rabbits, geese and ducks and they are in game and working fine (mode some chicken coops for geese and ducks, and got permission from Olli Modding to use his rabbit hutch).
Third, I made a Discord server. Link in my bio/profile.
Now I am testing 1ha of peach orchard, to make some math on the yield, price and juice production (Unfortunatelly,I managed to upset Kr3d0, and I am on my own with balancing them).
More updates will come as they occur, in the Discord server.