Sorry to hijack a build thread...
Blake, the dog bones should intersect and land on the instant center. Check out this link that shows how to find instant center on IRS.
http://www.corvetteforum.com/forums/...so-much-4.html
You can lay it out on the floor in full scale, then build your brackets off of that. Here is how I did it.
http://www.trifive.com/forums/showpo...6&postcount=55