Handrail part

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I'm TRYING to create a heavy timber handrail. I've used counters and I understand the counter to a point. What I'm trying to setup is having a parameter for the number of post(s) (ranging from 4" thru 8" in diameter)in the handrail, and also each post would have a moveable hotspot. Then for the pickets (ranging from 2" to 6" in diameter) between the posts to be spaced per a parameter. Also can the spacing start in the center of the post and go each direction to be evenly spaced?

Once again thanks for the help. I'm finally starting to understand the wide open world and the possibilities with GDL with the help of ArchiCad Talkers!