Are you joking? I could see the novelty of the whole thing but the functionality, not so much. I've seen these before attached to something other than a pv, usually in a head
shop. You won't be able to breathe with one of those on because the air intake is being replaced with your e cig and not to mention your face is going to be encompassed with a cloud of vapor. I've had to use a gas mask and they're already hard enough to breathe in without any modifications. I can see where your idea comes from but I'd look at this idea again and consider if you want to waste your money on the supplies it's going to take to build it. Good luck and if you do end up going
through with it, post pics, lol.