Here is the link to 3racings website - (http://www.3racing.hk/main.php
I have never ordered anything from 3racing before.
I have no idea how good their customer service is. I do know that they have been making aftermarket parts for many different cars for quite some time. Back when the Tamiya F201 was still available, 3racing made one of the better carbon chassis upgrade kits for that car.
You can find the 3racing TT-01 chassis available on ebay as well. I believe that there are 2 different chassis kits, one for the TT-01E and one for the TT-01. Here is a link to a TT-01 & 3racing search I did today (http://shop.ebay.com/items/__tt-01-3..._sopZ12QQ_scZ1
Hope this information helps.