So Having all four phases in one script

All in one script? How do you test that? I would have broken it into modules the moment I hit 500 lines. Especially since there is common code, and a large amount of it, that receives varying parameters: perfect thing to want to test that formally so that I can isolate a problem between called subroutines and calling code.

reduced total code lines because common elements are not rerpoduced in separate scripts

Uh, that's what a module is for. If you have cut-n-paste worry, then you aren't using modules right

a change to any common element only has to be made once instad of four times

Again, a sign that you don't understand modular development.

I'm betting I would cringe looking at your "script". Mostly because I've seen far too many already in my life, and I think I've nearly used up my quota. {grin}