Sorry to say this wont be as SQ as you think. Because no matter what gear you have, the stock head unit will be your weak spot dragging everything into the mud. Signal is pretty much the most important part in a sound quality install right next to the install techniques. The stock head unit will always be a garbage cut and built in factory EQ'd signal to hell and an audio control LOC will just amplify that garbage now you get louder garbage. You need a dsp that can flatten the factory EQ and signal sum to get a full flat starting signal to your drivers.
Also when you do components you are at the mercy of the vehicle's acoustics and the built in and unchangeable crossover point of the passive crossover. So your SQ results when going passive is literally playing the lottery which is not a sustainable business model IMO.
Also you wont have much of a soundstage due to the rear speakers or any form of time correction and independent eq and level adjustments so pretty much its gonna be a loud and clean install vs an actual SQ oriented install
In the process of getting a Dayton and everything else but I was curious and I’m sure I know what you’re gonna say but, in Hawai’i, not a lot of people even the car audio guys do SQ builds/set ups. So that said, I initially had plans of taking my Dayton in to a shop to do the tuning but I don’t know if any of the reputable shops even have a RTA mic. My question is, how essential is a RTA mic?