This is probably easier than you think. Why script it ? Does this need to be done repeatedly ?

If I remember right, I was able to open my Sharepoint "document library" ine "Explorer" mode, and drag a file structure into it. YMMV.

I also find documents on the web allowing you direct access into Sharepoint's SQL database, where everything is a list. so, DBI may be a candidate approach . Hmmm : it would be a great idea to come up with a DBI::Sharepoint module.