Blaine,
Good to see some advance thinking going on,
The parts your using appear to be strong but it never hurts to over built as long as it fits.
Being a machinist it's one of the things you do!
All metals, fastners have tensil strength, how much you can pull, shear strength, how much it takes to cut and ductility, how much they will stretch before failure. Every thing is only as good as the weakest link.
All this info can be found in machinist handbooks or you can go to websites such as
McMasterCarr- they have these parts with spec's
Mark
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