Addendum:

I'd considered keeping the directory tree listings in files, then loading the files into arrays. Like this:

(WeeklyDirTree.Csv)
\DownLoad\Weekly\raw
\DownLoad\Weekly\processed
\DownLoad\Weekly\analysis

I'd then declare the arrays in each script. Like this:

splice( my @WeeklyDirTree );

Then I'd read the files into the arrays.

That would automate propagation of directory tree additions or changes. But I'd still be doing the copy-and-paste routine in each script for the repetitive open-and-read of the directory tree files. Which still seems cumbersome and kludgy.