Thanks Helmut, your input on this build was invaluable.
btw, I found out the higher height of the rear spoiler you showed is on the later version of this car, along with the right side scoop.
The ARII car is the early version, but you need to add the exhaust rising from the rear deck, not out the back.
It also had risers on the carbs, so they stuck up higher from the bodywork.