Great kit with errors in the B-Note

The Super Car is a beautiful kit that has captivated my son (11 years) over hours and days. Some of the components are put together with a lot of effort - because dad, mom or big brother is then (if any) required.
What would be nice:
- An explanation of the operation of the transmission - the builders will know what they have built there, already recognize errors in the beginning, too - a subsequent change is namely to accomplish only with much effort.
- A blueprint for the second vehicle in print - load up the schedule from the Internet, I feel at the suggested retail price as an imposition.
- Lego parts of the kit can be completed in China - even this need not be at the high selling price.