Why don't you use the existing user/register ? I think this would be easier than writing all the code again, even if you have to set it up for different user classes (which is admittedly quite annoying).
Anyhow, I think you still need to create a node assignment for the user object. For some sample code see eg. the usercreatorwizardfinish.php in Kristof's project http://ez.no/community/contribs/import_export/user_creator
Good luck
Claudia
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