CCOW does not look simple, and writing a complete implementation would
not be trivial. I had a quick look at the specs and decided that this
would not be a nice, quick weekend project. However, I saw no reason
why it would not technically be possible to write at least a partial
CCOW implementation.
For anyone interested in more information,
http://www.hl7.org.au/CCOW.htm
seems to be a great starting point containing the standards and links
to helpful information.