Operations on NV center qubits
Suppose you can change anything you want around an NV center, how would you set-up your environment such that you maximize your control over the nuclear spins surrounding an NV center? Think, for example, about the geometric position of the spins!
You could space the nuclear spins as far from each other as possible within some radius, and align each one to the local direction of the field from the electron to maximize the energy splitting.