[Suicide Junkie]

In SE5, the whole leaky defenses scheme is not really possible as we know it.

Fixed percentage penetration instead of random, full hits to internals with armor degrading in absorption as it weakens.

Leaky shields can be done the normal way, but the downside is you lose SE5's fancy weapon animations.

Directional armor (IE inert internals) is not leaky, but it is tactically interesting in its own way.
Layered shielding (IE non-damagable, highly leaky armor) is interesting too, but it does the same thing every time; somewhat boring.