If yours using 2 drives ,an ssd & a secondary 1-2tb drive then leave the secondary drive disconnected until windows has been installed to the ssd
I'll be brutally honest here, your build is fine but I,personally would take the ryzen 1600 & 1050ti combo over the ryzen 1200 & 1060 3gb.
Obviously ideally it would be the ryzen 1600 & 1060 3gb but with an ssd & your reluctance to save money with an matx board it's not doable.
But for me the ryzen 1600 is boundless amounts better than the 1200 whereas the difference between the 1050ti & 1060 3gb is not as pronounced.