Be careful when you screw the gearbox together,I found that the gears did bind a little so you may have to back the screws off slightly. I know some people that didn't have this problem but I did.
If you have a Dremel,you'll need to put a groove in the chassis where the bottom motor screw goes in. You will struggle to get it in straight if you don't and may cross thread the hole.
Other than those couple of things I would say it's a straight forward build. Only run mine once up to now but was very impressed with it
This a set up sheet from Craig Collinson for his tc02c Evo from Chadderton.