Dependent Dropdowns in Drupal 6 CCK ?

I am putting together a site where I have a set of terms that need to be assigned to a node during node creation. In this situation when a user creates a node, a drop down list of terms are presented to the user. Each set of terms is dependent upon the users previous selection in the dropdown to make selection of terms less cumbersome and overwhelming since there are thousands of possible selection combinations (ie. Manufacturer->Make->Model). Then the terms selected need to be used to make up the title of the node (i.e Manufacturer->Cessna | Make->Floatplane | Model->180 )

I first attempted to use Taxonomy, Hierarchical Select, Automatic Nodetitles and Token to do this, but later found out that Automatic Nodetitles could not use taxonomy terms for the node title during node creation. So then I turned to using CCK fields and hooking them to another database table that contains my set of terms as outlined inDependent Dropdowns in CCK, a Tutorial .This tutorial works great in Drupal 5, which it was written for, but does not work in Drupal 6 and the author does not plan to port. Has anyone had success with dependent dropdowns using CCK in this type of scenario using D6, or is there another way to get this type of functionality in D6 that I am overlooking? I am not opposed to having a custom module developed if that is what needs to be done, just wanted to make sure I am not overlooking something since I am fairly new to Drupal. Any help or guidance would be greatly appreciated. Thanks.