Having done the conversion from PostNuke (723) to Drupal (4.4) for Gold Country Paddlers, I've been asked to do another conversion. Since the site is *significantly* larger than the GCP site (contrast: GCP was about 1000 entries when I converted it, the new conversion will be over 3800000 entries), I'll be running test cases and adjustable SQL scripts to do the conversion.
One of the requirements is that the site be offline for as short of a time as possible to do the final backend conversion. Some module development will also have to be done, as not all the PN modules are available in Drupal.
That said, here it the journey.