I recently purchased a T from I guy in Cal. My father built one when I was a kid and I had to have one. My question is, every T I have ever see had a version of the 1-1/2"x3" boxed frame, but mine actually has a twin tube, mandrell bent setup. The tubes run parallel to each other (one on top the other spaced about 3" apart) Along the engine area from the body to the front end it has flat steel welded between the tubes I am assuming for extra strength and to allow for any brackets that were needed to be bolted easily to flat metal rather than tubing. Has anyone ever seen this before or know anything about these types of frames. I don't seem to get any bouncing or much flexing, just interested if anyone else has any input. Great site, you guys are really helpful and look forward to posting and trying to help when I can.