Foreword: Sorry for the poor format (and English). If anyone wants to implement them, I could provide further help on numbers.
For now, once you are good on Electronics/First Aid, CBM becomes OP without any significant drawbacks. Eventually you’ll have 2000+ CBM power capacity and dozens of CBM.
I would suggest that:
[ul][li]Every CBM parts shall have a “volume”, it occupies some space in your body, limiting the numbers of CBM you can install.
For example:
Head: 20/20 Eyes: 5/5 Body: 40/40 Left Arm: 15/15 Right Arm: 15/15[/li]
[li]The “capacity” of your body will slightly increase with your First Aid skill, but won’t be too much (maybe 50% at most).[/li]
[li]Some CBMs can only be installed in related body parts:[/li][/ul]
CBM Volume Body Part
Expanded Digestive System 5 Body
Internal Furnace 15 Body
Infrared Vision 3 Eyes
Targeting System 3 Eyes
Fingerhack 3 Either Hand
Power Storage 1 Any Parts
[ul][li]You cannot have several Eye modifications at the same time.[/li]
[li]Power generators CBM occupies a large space, installing more than 2 is almost impossible.[/li]
[li]Power Storage CBM has 1 volume, so player could use it to fill up the “free space”.[/li]
[li]Mutation and CBM could be mutually exclusive, getting both of them would lead to a “debuff” or decrease on CBM performance.
On the other hand, there could be some kind of CBM-friendly mutation, not so powerful but providing a variety of choices.[/li][/ul]