My question was not how to fly through C.B.'s saudipc-9 it was what altitude would you fly at if you were forced to fly through a line of thunderstorms in frontal system that you could not get around.
I am aware it should be a rare occasion but if you are flying long ferry flights in some parts of the world sooner or later you may have to decide how you are going to fly through the front.
Flying is an activity that can sometimes become very dangerous no matter how careful you plan.
I don't know anyone who will deliberately fly into an active C.B. if they can avoid it, but there can be times when you may end up inside one no matter how hard you try and avoid doing so.
It can be done without ending up dead.