Just to clarify, I didn't intend to jump on here to embarrass the discussion in any way. I noticed a spike in my website traffic and followed it back to this site.
I'm thrilled to find people interested in the function of motorcycle components because I spend much of my time trying to make a part that works better, not just looks better. This in an industry dominated by the latter.
Structural concerns are well warranted! I'm sure many of you are familiar with the experience of riding a newly assembled motorcycle, and even under a simple wheel replacement, small bolt torquing details are things that begin to haunt you as you come up to speed.
The best analysis I can gather at the moment is these clamps should indeed be very strong, and for this type of load steel has more favorable attributes in every aspect over aluminum (save for weight), but nothing more specific than that. I've enlisted the help of a thermo/fluid science engineer to run analysis using ANSYS and LS-DYNA, but even he agrees the most practical information will come by way of comparative destruction tests.
I'm as excited as anyone for the results, and while I'm now tooled up to build multiple sets, further construction won't continue until testing is complete.
Having said all that, I'm putting the current set on a personal off-road bike of mine and riding the hell out of it. I've got a good helmet and health insurance, mind you, but wish me luck just the same.