To be honest, I don't see the need for the shields on the free Sidewinder at all if you're not planning on fighting. If it gets blown up, you get another, minus a reasonably tolerable loss of cargo, certainly nothing like the benefits of extra capacity. As long as you keep a decent percentage of your credits out of commodities at any one time (mine is 40%), you can get squeezed into the docking slot by an Anaconda which still can't fly straight and still be left with enough to get going again straight away. The scanner is just free money, I don't see getting rid nearly as beneficial as freeing up the slot taken by the shields. 