Found some great points of info from Car and Driver Via Morse Measurements. RCs height, anti-squat and anti-dive per axle, roll stiffness, etc. Useful stuff in general to understand the dynamics of the 86.
These could used to help verify the suspension coordinate estimates.
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DIY I'm looking to develop a suspension model for the 86, just for fun at this point. Once this is done I can help you develop a double wish bone setup. Why do you want a double wishbone setup? Is there something about the stock macpherson that you're unhappy with?