The hexagonal tube mounting rings will consist of two layers of 1/8" thick 6061 aluminum. I can either make them 1" wide or 1/2" wide. From experiments with making these 1/2" wide, my guess is that two rings that are effectively 1/4" thick and 1/2" wide are probably sufficient to hold a 60 pound tube without flexing. Two such rings would weigh 1.60 pounds; if they were 1" wide instead, they would weigh 3.20 pounds. Obviously, reducing weight is still a critical issue for me.
I am going to have my local metal retailer cut these, but once I have bent them, there's no easy way for me to cut 1" wide down to 1/2" wide. Any guesses as to whether 1/2" wide will be stiff enough?
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