The technical part of it is definitely the most important.
The legal part is only about whether the low power electric carlets with max speed of 50km/h can enter cycling zones and other such areas, which would give them advantage over classic car.
The economy is more about the energy consumption and how to deal with the logistics of charging those glorified shopping cart.
The technological part will be the most important, because there are loads of those little fuckers and I will need to find a criteria relevant for the intended use of the car and then compare them and pick the best options.>do you have a minimal number of pages you have to write
These things tend to be like 40-80 pages as far as I know, but I am pretty sure the assignment itself is for the professor personally, because he is thinking of starting a project like that.