While taking a break down town a few days ago I started working on ways to divide the various options available to the Adeptus Mechanicus Planetary Defence Force into sections. The idea being not only to give the army some character and flavour but to help balance the list.
War Engines such as the Leviathan, Capitol Imperialis, Hellbore and the Ordinatus
Infantry, Praetorians and some support upgrades such as fire support troops and assault tanks
All of the regular skitarii troops, and more advanced tanks and SHTs such as the Leman Russ Executioner, the Conqueror and the Stormblade and Stormsword. Typically deploy in Rhinos
Imperial Guard Militia
Basic infantry, some support options, artillery and Leman Russ and Baneblade tanks. Will have a lower initiative than the Skitarii or Tech Lord formations
The idea being that the lower you move down the hierarchy the worse the equipment gets and the lower quality the troops are. This will be made up for in numbers. The Skitarii will ahve smaller formation sizes than the Guard will.