While building the scaled-down version of this file I found that it never should have taken up as much computer resources as it did - either disc space or RAM. Somewhere in the file there was something - an error of some type - causing it to occupy much more of these resources than it should have - or was necessary.
I have no idea what it was - nor will I expend the amount of time and/or effort necessary to look for it. It will be rebuilt from the beginning. All traces of the original version have been erased and discarded. At least I might be more familiar with any errors that may occur while building the new file.
The new version will not take nearly as much time to construct as the old.