I understand the point of making a rear knuckle for strength and the separate ebrake caliper, but to correct roll center it would be better to make a new lower control arm.
There are not any really good LCAs available (front and rear). None of them are catered to extremely low cars, they just don't adjust far enough to make a big difference. You would also be able to adjust the track.
If you guys made some LCAs with nice spherical bearings and heim joints I would be extremely interested in a set. I'd rather buy nice ones then start welding up my own, but I may end up doing it this winter.
Oh definitely. That way your FLCAs are designed in a way to work with your super angle knuckles/super angle knuckles in general (ie not get hit by them). They could be made to work specifically with your rear knuckles as well. I mean I would buy the knuckles just to get the spherical bearing replacement on all of the arms, and I would definitely get your control arms if they could adjust roll center enough (you need a good 2-3" of adjustment I think).
Just be sure if you do control arms that you use an inclosed spherical bearing for the joint that mounts to the spindle instead of a heim joint. It would put the rod end in bending at that location (but it is fine on the inside mounting part by the subframe).
An easy way to go for the control arms would be to just pick up a bunch of nice spherical bearings (QA1, Aurora, something like that) and weld in housings for them and make a bolt that has the right taper for our spindles. They make lots of stuff like this for stock cars, but nothing in our taper. Here's a website with the different parts on it that you would need to completely replace the ball joint:
I was going to go with the parts from that page and just get the spindle bored out to the Chevy taper, or get a straight bolt and drill out the taper all together. It would not be as strong or secure but I doubt it would fail so long as you had a strong enough bolt. Then just take out the ball joint, weld in the bearing housing, press the bearing in, slap a c-clip in there and bolt it up. This could be done on a stock control arm pretty easily with just some reinforcing and you could put a heim joint on the other end like the kit battle version offers.