The power system looks good, 12" prop on 4s is good. Ecalc is a good method to check everything out and then a watt meter when you put it together to double check. 60 amp ESC for a 40 amp draw is good.
Any advice on how to go about centering the motor on the firewall, there’s no real clear location for the prop line watermark. I do see the thrust line angle but I’m trying to determine if that’s also the waterline mark for the center of the prop shaft?