The aero data is from a Prodrive wind tunnel session at MIRA & the brake calculations are based on excellent data from the forum autocross community. It matches plotted curves to within a couple hundredths of a degree throughout its full travel. The entire suspension was measured on a lift and rechecked at static height on the alignment rack. (Unsurprising, I know.) I've logged and matched as many things as can possibly be tracked with my OBD-II datalogger. On the physics side the car is built from the most accurate and specific data I've ever had for a project. It wasn't practical in a game model to perfect literally everything, but I genuinely doubt there's a more 3d-accurate sim mod around.
I then spent a solid week playing the 'well actually' game with any and every detail I noticed that wasn't spot-on. From there I spent about a week playing photo monkey, dodging rainstorms & getting detail shots of anything that needed it.
Starting with the most obvious bit, Dan built the entire thing on a full 3d photo scan I took of the real car in my driveway. Self-promotion really isn't my strong suit but I can't post this car without bringing to light just how much attention to realism and detail we've put into it. WELCOME TO THE Subaru Impreza WRX Challenge
