Seriously, it cannot be that hard to build a 718-style car out of more mainstream parts and materials, for 1/2 to 2/3rds what a 718 costs, without the “Porsche” badge costs. Subaru has the turbo flat-4 engines, more established than Porsche’s new ones. Subaru has a cable-shifted 6-speed manual gearbox in the WRX and…