What about ammo type damage or in tech like for turrets, or ammo for gun independent of levleing up in tech tree.
The next "level" of this mod or mod modyfying this one (so people can chose) could be to make TERMINATOR frame and all the rest add in grid like for vehicle: shield, generator, bateries, and gun: machine gun, flame trower, cannon, laser or rocket even support type - with roboport and robots to heal with repair toools. For people with hard mode it can have 4x4 grid and equipment 2x2 - so 1 shield 2x2, 1 batery 2x2, 1 generator 2x2 and 1 gun or roboport 2x2. And of course tech MK for all grid equipment to get stronger and stronger but more expensive unit.