Homebrew PCBs

Hi

This is a bit of a strange question. I keep stumbling into strange (but 
interesting)
projects to play with.

What is the maximum vibration level and/or G force standard smt or thruhole
will tolerate ?

I've been asked if I could figure out a electronic detonator for an 
airburst charge
for snow guns. These are the guns/mortars they use to fire 4-8lb charges at
potential slides to trigger them. The trigger will be a pic that simply counts
and then fires a electric match after the preset delay.

I'm hoping this will prove tremendously difficult so I get to "work" and 
have to blow
things up all winter ;-]

Tia

Dave