Heres an idea, instead of letting the crims live in the lap of luxury, why not let them build their own prison. Get the outer perimeter constructed with all the relevant alarms, barbed wire, electrification etc, then dump the crims inside with relevant building materials. They live under canvas until the prison is built to the required standard. Cheap way of getting the work done, and they learn a skill at the same time as keeping them so tired that they don't cause any trouble. Discuss!