What is the upgrade path from Drupal 4.7 to 5.1

I would like to upgrade my current Drupal 4.7 platform to Drupal 5.1, just wondering if there is proven or recommended path to follow.
I used flexinode for the 4.7 version. Is it upgradeable to Drupal 5.1's CCK through some tools?
For functional modules, will the table definition be different?
Your comment and assistance are appreciated!