Force field questions

[Mgellis]

This is following up to a couple of earlier threads on this topic because I want to make sure I've got this right before I help a player with his character...

Option 1:

DR 10 (Force field, +20%) [60] is, for all practical purposes, super-skin. It provides a sheath of power that covers your skin, your eyes, the insides of your mouth when you're talking, etc. It's always on, but it somehow knows when it's supposed to let things like air and food through.

Am I getting this right?

Option 2:

DR 10 (Force field, +20%, Switchable, +10%, Area Effect, +50%, Nuisance Effect, "two-way fence," -5%) [88] is a more typical force field, the kind you might use with a spaceship or a superhero like Sue Storm. You can turn it on and off at will. In fact, you often have to turn it off because it tends to get in the way of things. It's a two-way fence. It's hard for you to reach stuff outside the field. It's like a wall surrounding you. You can wear armor. And if something is inside the field when you turn it on, you can manipulate it or pick it up. But if you move around, your force field moves with you, pushing things away, etc. Shooting through it is as hard for you as it is for people outside. And if something is so large and you couldn't normally move it with your ST, you can be blocked by it while your field is on if you can't get around it.

Does this sound right or is there another way to build this?

Option 3:

How would you handle a "sealed, but eventually you run out of air if you leave it on too long" limitation? Still just part of a nuisance effect (which is the simple way to do it) or something else?

Thanks.

Mark