fabian, you have a link to the system you are proposing? because i cant find it,...
i used wc lights and charger module, and coil ,,but you did not specify what motor you have so i didnt go into that
i used a battery i got elsewhere,..
if you want to use the hub gen, the 6 volt system will work, i do like their lights,.. the module for charging i have works well,..
i would buy the led lights and charge module,.. and possibly battery from wc, but in the end it is up to you