ZBrushCentral

How to make a Weapon?

So i had some sub compact gun ideas but im not sure how i would get those ideas implemented on zbrush. I imagine zspheres are the way to start up but later on in the sculpt (if i manage to get that far) how would i apply minor add-on features to the weapon. like bolts or the end of the barrel sticking out?

I would use Schadowbox to build a wapon!!
gr. Silberdenar