It all depends on what you actually want to achieve.
If you want to enjoy watching the baby rabbits grow, then just build some cages for them, where the wild mother would feel comfortable, ans where the cats cannot go. (I know, quite conflicting requirement :) )
If you provide food to the mother rabbit, then she will not even need to go out for food, so she ...
I found these websites helpful:
veggies for rabbits:
veggies for guinea pigs:
you can find the calcium level on this site. High calcium level is ...
In nature rabbits eat more leave-like greens than grass (what hay is produced from). So you could use any rabbits' taste fitting leaves, like European acorn, dandelion, European oak, apple, plum, daisy, strawberry, raspberry, peach, carrot, garden radish, cabbage (if you do not feed grains), hazel, European chestnut, European linden tree...
There are lots of ...
I would probably construct a tunnel - choose a width that fits your rabbits’ body size. Rabbits’ main axis is horizontal, crows’ vertical, which means that rabbits love tunnels, birds don’t.
Maybe you can find a pipe that fits or construct something out of wood.
If you want to make it extra-uncomfortable for the crows, include a curve or bend, that should ...
You should feed them the same as you would feed to adult rabbits:
fresh herbs (make sure to check they're not poisonous to rabbits)
Source 1 Source 2
If you were to feed formula, according to rabbit.org, cat formula is actually recommended. There's also rabbit formula available, according to source 1. You can order it ...