Yea, but I'm asking how to make a weapon that fires as you touch the ground. Since then, I found a site that may just help on this:
http://www.cncden.com/forums/showthread.php?p=257370
It is a forum that talks about other stuff, but about half way down is an exactly the information that will help us. The only change is to make the death weapon on this guys parabombs into NUKEPAYLOAD and forget about the other SuicideBomb part and the Super2 warhead. Thanks Fenring for this very helpful bit on doing parabomb.
The only thing I haven't found was a parabomb SHP.