Thanks for the response guys.
I have done plenty of back halves with MS rectangular tube with both mandrel bent and fabricated rails. Was just looking for some different perspectives and preferences on this.
Thanks, Bill
Ed: A.R.T., Alston and a few others offer kits simular to the one below, this is just an example of what I was refering to. Obviously rear strut tubes, X-brace and much more diagnal bracing is required to make it rigid enough.