Do a search for Hottop on this site, check my thread on importing the HT last year. I downloaded a bunch of forms from the Customs website, and fronted up to the Customs warehouse.
On top of the few hundred dollars in duty, they also charged about $50....for taking the manual forms over the counter!
The Customs officer had to rewrite all my forms..(20 pages +)
The only other people in the room were Customs brokers....
It might be worth getting a quote from a broker..they may save you some of your hard earned!