The various anarchist factions all over Rossbera use a specially-designed light tank to maintain supremacy in the rugged regions where they build their bases. The baseline variant is armed only with a heavy machine gun, but crews of these tanks customise their machines with all sorts of additional weapons, armour, engine upgrades, and spiky bits.
Kitbashing is encouraged, though I have only one other turret that will fit in this hull at the moment. I show some better pictures and more information
here.