Working on Gantz(manga) weapons, could use some advice in regards to projectiles, etc

[Metal_Izanagi]

So, I'm trying to put together some Gantz weapons in the GECK. I'm using stand-in models from vanilla resources for now, possibly until I can either make some models myself, or find someone willing to do so, and don't plan on requiring any DLC for the weapons to be useable. A while back I saw a great Gantz suit/sword mod, and couldn't help but wonder how awesome things like the X-Gun would be in NV.

The thing(s) I would like a bit of guidance in regards to how to do them:

Getting an invisible projectile with a three-second timer or so, so when you shot something, it would have three seconds to kill you, or at least contemplate its existence, before...

A projectile that explodes in a burst of blood and gore, harming /only/ the target, and affecting the body part hit(obviously a body hit would be quite messy since everything is connected there), and maybe people close enough to get hit by the blood. Kinda like when you blow up a limb in the vanilla game and you take almost unnoticeable damage from the "explosion". Think of it as bone and meat traveling fast enough to sting a little, or maybe getting blood in your eye.

For reference:

/>http://gantz.wikia.c...Gantz_equipment

Right now I'm working on the X-Gun specifically. Once I can get the projectile working correctly, I have another task: Making the gun accurate to a godly degree in VATS, to simulate the time taken to use the lock-on feature that the first trigger would supply. Maybe adding a VATS-only attack that would cause the target to detonate completely. All limbs, the head, even the torso.

Sorry if this is a lot to ask how to do in one go, but I've tried a few things myself, and managed to get no results near what I wanted.

Maybe I'm missing a step somewhere, but I made a projectile with no actual model, and told it to act on a five-second timer(I'm still playing around with how much time I should give it) and despite the gun firing and using an energy cell, nothing happened after five seconds.