I have once particcipated in a similiar project. One thing that I find can be easily overlooked is that a lot things, specially in small farms are very specific to the location and the specific varieties of plants you have. Trimming dates can change by more than a month just be moving a few hundred km. Same with terrain conditions and that could just change from one farm to the next. I'm not sure if that info can be systematically gathered and distributed without being extremelly complex at the same time.