LOL, we're not trying to be haters, it is a great build. We just want you to be safe. When a drive shaft goes out it can be very dangerous. I was lucky mine didn't hit the gas tank or get under a tire to spin or flip my car. Mine bounced and lodged between the car body and the exhaust. It beat the hell out of the unibody in the process, leaving a big dent in the passenger front floor pan. It struck right at the corner where the steel was strongest too so there was a lot of force behind that hit.
Wall thickness is much less important than drive shaft diameter vs. length. A quick Google search for driveshaft calculator pulled up this one:
http://www.wallaceracing.com/driveshaftspeed.htm
With a 53 inch shaft at 2.5 inch diameter you'll handle plenty of torque. The problem is the critical speed. I don't have the calculations lying around for what our drive shafts spin at but I know that it was up around 5-6K rpms at 65-70 mph. If you drive at or above the critical speed of a driveshaft for long harmonics can cause it to start wiggling and tear it apart. They have some pretty good explanations on the site. To calculate your drive shaft speed you need your tire diameter and rear gear ratio. I'm sure you can get that stuff off the web quickly too.
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