Figured since there were no replies I was being a dummy...I was right. I didn't realize the link I was accessing started on the 3rd page of this thread, so I missed the first two of the build.

Seems to be fairly simple, but I haven't done much welding. Any insight for someone trying to tackle this?

Since I was the main contributor to that thread, I will chime in.  Go there and look at the second post.  That's the basic example of a simple rearset bracket.  

The ones I made are very similar to what Ryca made except I made them in two pieces and I made them to accept mid-control.  Simply modify the side plate as needed to locate and accept the rearsets.

And since your life depends on this, cut the pieces as need and have a pro do the welding.