Basically, everyone knows that villagers never seem to do anything in mods. However, in this suggestion, they can be used. Basically, you first need to craft a Conversion Chamber. You then push a villager into it and close the doors. After about 10 minutes, the villager will be fully converted into a Cyberman. Perhaps what Cyberman they become could be customizable. The first Cyberman you create is assigned the number '1'. You can craft a device and name it 1 and then place it one a block, and your Cyberman will patrol in a 5 block radius of that block. Your next Cyberman is assigned the number '2', then 3, and so on. The machine can also be upgraded, to give your Cyberman things like a larger radius, stronger attacks, upgrading it to the next Cyberman design, etc. To make the process of taking villagers easier, you can also craft a Cyberman headpiece and give it to the villager. The villager will automatically walk into the conversion chamber. All the items that villagers would trade to you are collected and placed into a chest compartment of the chamber. Putting the headpiece and the machine telling a Cyberman where to protect will make the device portable, allowing the Cyberman to patrol an area without having to place the machine down. However, if one of the machines is destroyed, the Cyberman will no longer follow your orders, and will attack, as well as destroy other machines.