So mechanically, the rule of thumb is to have the same thread engagement length as the studs diameter. Example: If your vehicle is M12x1.5 => 12 mm diameter > use 12 divide by 1.5 (dia/pitch) => 8 turns of the nut. And in the case of type R M14x1.5 its 14/1.5 = 9.3 => Round up to 10 turns.
Both Genesis Coupe and Stinger would work I would recommend some machine work on the Stinger caliper as it off center of the rotor by about 1 mm. Rotor is Nissan Juke Nismo RS (2015 i think but check the spec). The juke got better pad contact due to smaller hat but would not fit older civic...
The 0W-20 really is just for gas mileage. Protection wise, the 5w-30 probably protects your engine a bit better. Especially if youre in hot climate. I use 5-30 in summer and 0-20 in winter.
I do recommend extending the template to go over the entire wheel hub. so that they can just place it inside the hub a opposed to hanging it and hope that it approximately centers.