what is most likely to break while spraying a 100 shot?
what should be the first few things i should think about in terms of safety other than a fuel pressure safety switch?

 

With a 100 shot on all the proper safety gear, you shouldn't break anything. Along with the FPSS, definitely a window switch should be incorporated into your setup as well. Check out this sticky as it gives some good info on the safety gear: http://web.camaross.com/forums/showthread.php?t=496116