Even though wouldnt improve the fuel efficiency, showing why it wouldnt work is still good reading for whoever will be marking it.
I had a similar project back when i was in college, after AF447, i chose to make the FDR and CVR able to float, with a mechanism to get them out of the aircraft upon impact on water. The theory was all there, its possible, practically, no, it wouldnt work.
One way to show why it wouldnt be viable would be comparing the weight of the solar panels required to produce power, compared the the same power output from one 'genny'
I mean..The 787 has 4 generators (5 including the APU) that produce 250kVA each, could compare the weight of one 'genny', to the weight of the panels required to produce the same output (+ the additional equipment).