CGX car nut:
The integration of the various technologies is almost impossible to duplicate within a reasonable expense, and time framework, unless one is running a race engineering firm. The aerodynamic work on this car is a staggering achievement and then add the power plant and other systems I really doubt a hobbyist would even come remotely close, especially for the price.
I agree that you could never compete with the high tech solutions. You'd have to take a simple approach of minimum weight, high power, fixed aero, and large sticky tires. The result could possibly be faster on some tracks, but the price wouldn't be far less, the safety would be suspect, and the return on investment would be questionable too. New RS at MSRP is the much better option.
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22 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 18 GT3 Manual, 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi