Hi Richard,
Looks like an interesting build, the Gear Vendors unit will make it much more flexible - I assume you're running 3.7 or 3.9 diff ratio?
I was looking at your rear suspension setup and it seems to be a good solution to the dreaded camber and toe inducing trailing arm debarcle that was standard in these nuggets. There are a couple of things that you may want to revisit regarding your upper arm design though.
1) You'll end up with a roll centre well below your centre of mass which isn't ideal, I'd say somewhere about 120mm above ground level
2) I reckon you'll get some crazy camber gain on bump, perhaps you could drill some more mounting holes so that you can adjust the inboard mounting point up at say 25mm increments? It's going to squat pretty hard with a V8 in the front, so you want to get all of that rubber on the road!
Great build, nice to see something different.