RE: where is heng long website??
I did some research on this when they first came out and you will not find a site that is persay Heng Long, the name is just a product design name and the owners or registar of Trade Mark (TM) of the name is most likely a design company that sells OEM rights to manufacturing companies in places like Shantou China. I could not track down the product design firm because of the language barrier.
Hope this helps