I like your roof top garden, Ricardo. I have my own garden at home because I just love gardening. I also experienced the problem with caterpillars, beetles, rabbits, squirrels, etc,. What I did to minimize the problem is planting them apart with enough space for the sun to go through. Second I sacrifice a little separate space growing a mixed of vegetables with almost no space in between them. Most of the time these unwanted visitors come to enjoy the meal in that separate space. Sometimes I talk to them [Maybe I just talk to myself.]