For OpenOffice.org, you don't have to create any additional files, the inclusion of your tables is handled by the Braille extension.
4. (and I simply may have to do my reading), what files / file types do I need to create to ensure compatibility with LibLouis and Liblousxml (Open Office, NVDA and Orca are my main concerns for initial compatibility).
PS: I collected some extra hyphenation tables, including one for Icelandic (Czech, British, Estonian, Irish, Croatian, Hungarian, Icelandic and Turkish). I found them here: <http://www.ctan.org/tex-archive/language/hyphenation/>.
Bert
