Aluminum Drive Shafts.... thought?

I had an aluminum driveshaft built for my Cortina. 4"shaft, 1350 joints, and billet steel yokes both ends. Probably way overkill for the car weight, but I wanted a bulletproof drive train, and I got it. I don't remember who built it (it has a manufacturer sticker on it) but it was reasonably priced, at the time. I'm betting it's double what I paid now, at least.