To prevent anyone from having 1 type of company filling their regiments. I'm going to have types of battalions you can organize. The lyrans will have a heavier structure and less options. Clans will be free to build what they can.
Lyrans assault heavy medium light
Assault 3 0 0 0
heavy 1 2 0 0
medium 0 1 2 0
light 0 0 0 3
Non-Lyran IS Houses
IS Houses assault heavy medium light
Assault 2 1 0 0
heavy 0 3 0 0
medium 0 0 3 0
light 0 0 0 3
OR
IS Houses assault heavy medium light
Assault 1 2 0 0
heavy 1 1 1 0
medium 0 0 3 0
light 0 0 1 2
Periphery assault heavy medium light
Assault 1 2 0 0
heavy 1 1 1 0
medium 0 0 3 0
light 0 0 1 2