I am in the design phase of a lightweight electric city vehicle with a capacity of 15kWh. I am at a stage where I am moving elements like Electric motors, tranmission, DC-DC converters, Inverters, Battery charger and battery pack in a CATIA software model. In-order to cater to the wide-range of requirements, I aim to create 5 prototypes and later simulate these models for the NCAP crash tests. My question at this stage is: Can I place the different components of the electric vehicle where-ever I like without constraints? for example: Does it make sense for the battery charging pack(they call it "Batterie Ladegerät" in German) be at the rear of the vehicle and the battery pack at the front like the VW XL1? I mean, how much heavier are the cables going to weigh in particular cases? Can you suggest a good book on`Electric vehicle component package ideation´.