Well Carl,
When I first bought my Supra brought him down to the toyota dealer. The U joints in him were bad, so sent the drive shaft down to the shop. So the U joints were changed in a professional shop and it was balanced. Well that did not eliminate the vibrations. Sent it back to the shop while replacing an axle and rebuilding the differential and the other axle. Put it back tougher and still had the vibration. At this time "genius" realized it was the drive shaft when I saw Ford on it. Got a replacement 2 piece, sent it to the shop. Put him back tougher and the drive is as smooth as smooth itself.
What you do does sound like fun, but not sure if I could take the g forces on the sharp turns. Do be careful Carl and enjoy your racing time
You are right a sitting car is so much decoration.