The items that led to worked well, if it was a bit tedious to get all the workbooks downloaded. I ended up using a shell scriptlet on a Linux box to rip out all the workbook names from workbook.xml and spit out formatted "tabcmd get" lines.
for file in `grep repository-url workbooks | grep -v sheets | cut -f2 -d\> | cut -f1 -d\<`; do echo tabcmd get \"/workbooks/$file.twb\" -f \"C:\\Tableau\\DS Analysis\\$file.twb\"; done
Once I had those, the analysis utility was excellent.
Very nice approach. Simple and fast!