I have bought TT-02. Actually I think it is quite sturdy and more rigid than a TT-01. For turn buckles, I just changed one linking the steering servo and the steering setup for L/R adjustability, which I just need a Tamiya HK$40 turnbuckle set.
On the other hand, I found although the package do offer 2 x long hex for wide wheelbase, it did not come with the long axle cup and without which I don't have enough screw depth to screw on my wheels after the long hex is installed.