Fit
I'm pretty sure you can just bolt the graphite chassis on. A buddy of mine went from the tub to the saddle pack chassis and I'm pretty sure he didn't have to make any other chages. As I recall, the stick pack chassis comes with the matching top deck, but I'm not sure about the saddle pack chassis.
wyd
How's the TB01 running for you? A couple buddies of mine gave up on them because they couldn't keep pace with other cars. They seemed to think that the drivetrain was too ineffecient and they was why thier cars were slow. I didn't want to rub it in any more, so I didn't ask them too much about it.