So easy ? nooooo.
Everything is hardcoded including the menu.
You have to add a new class and ID in incar ( right ) and in the gdb.
You must create e new menu entry and add it into the curent one and a new menu page including all required icons.
If there is a mistake anywhere -> CTD.
If you change gdb -> online mismatch.
Its only made for this page, because we are a closed group and we do not have public uploads.
We can handle all the required changings for a 2nd class.
When there will be some public release with some new car, there will be also the confict, that one guy must build the menu for all cars and the gdb including a unique ID.