Allrigh since you ask First, I like that original geometry is retained. That's easy way to avoid mistakes making it worse. I also like that there is no modification needed to subframe.
Build quality and attention to detail looks great.
Target group for such setup must be racing or serious track day use. There's no sense just for street IMO. With track suspension setups you usually want to get rid of flexible rubber bushings by replacing them with something stiffer or better yet with spherical bearings. I don't see sense in making such a nice adjustable setup but using the original rubber that let's the angles go all over in dynamic situation. I would at least like to see planned solution to go to uniballs/spherical bearings, whatever to call them, if and when wanted. (basicly same what uai wrote).
I like utilization of e30 ball joint. Effective and simple. I don't know if there is some flexible element inside or no. If yes, is there a stiff option available that would fit?
Reliability? You sure seem to be qualified making such designs but still I'm a bit suspicios about reliability and strength. What's the size of thread in those eye bolts? Are you sure they can handle fatique in long term? With slicks over curbs?
Longevity? How long will those plastic bushings live before they are loose as hell? In water and dirt? There's quite many joints and lashes tend to stack.
Eariler I didn't see the plan using spirolocks on the pins. I guess they can be trusted, though I lack personal experience on those.