You have said that the rabbits will be living outside in the 4 x 6 run with the 1 x 3 hutch as their hidey hole. You have also mentioned in another thread that you do not have any other hutch and that they are going to spend the night in the garden in their run.
You have foxes visit your garden and have already lost a rabbit to one of these. Can I ask you to consider what protection your rabbits have from a fox, just the sight of a fox can frighten them to death. In a run without a hutch to hide in and only a tiny shelter which is not big enough for 2 rabbits they have no where to hide.
If your garden is too small to have another hutch or run could you get your father to build a hutch on top of the run this would give your rabbits a more usable space where they can hide from predators.