I did the same thing about a month ago except I didn’t paint the calipers. It was probably one of the “biggest bang for the buck“ upgrades I have done so far.Just completed my GT brake upgrade yesterday and it was easy and looks awesome. Bought almost new GT calipers off EBay, brakes rotors from Advance Auto and stainless steel brake lines from LMR.com. Painted calipers with G2 paint and high temp stencils then applied high temp clear coat paint.
Bleeding the brakes was quick and easy and couldn’t be happier.