This is the unfortunate limitation of not being able to create new base prototypes, so I am stuck with using copied roboport, and second part is that there is also no way of changing which stats get changed by quality, so for this purpose quality is essentially useless.
I have tried with different prototype copies with in-place replacement for different 'quality' - I use quotes because it was just an obfuscation - but the logistics were all over the place, ghost entities did not show range correctly (this is the same issue as Quality roboports faces btw). I decided that the correct visuals for build and logistic range are paramount for the 'feel' of the mod (it feels weird when the range indicator shows one thing, and then abruptly changes when built, and same for build reach), so I went with totally separate entities, which unfortunately means that quality really doesn't do anyhing
