If you have not made the control arms yet
and you have the body
and you have the wheels you are in the perfect spot to make your car look correct.
Put your body on the chassis and center it as best you can - fender lips equally spaced on both sides to the frame.
Put your wheels under the body and place them exactly how you want them to look.
Measure from wheel mount surface to wheel mount surface (the flat part, inboard center of wheel).
Give me that measurement and I will tell you how long to make your control arms.
The naerc plans are for the naerc body and naerc wheels.
Bodies are not created the same widths and wheels come with different offsets. This method will make it look right every time.
No suspension in this photo