New implant ideas/organs

[A_Spoony_Bard]

<Haine> jam an emergency e-tank in the place of a lung

I really like this idea, perhaps you should be able to put an e-tank in in place of a lung, giving you internal internals, but since you only have one lung, OXY damage you take is multiplied? Basically you'd be protected from almost any OXY damage until the tank runs out, but once it does, you take increased oxygen damage.
Bonus points if replacing both lungs with e-tanks makes you function as though you don't need to breathe until the tanks run out, at which point you almost instantaneously die of OXY damage.