Yeah, I don't like the idea of alum threading for milling jigs but one offs don't bother me. And I'm sure I could get a couple dozen jobs out of this before any worries. And I have the aluminum stock on hand, no steel around to use. But,,,, I have been wanting to make a bolting plate for the rotary table. If I eventually do it will be made out of steel, something that I can use for whatever other projects the future holds.
Another thing on the list of toys and items I am going to steal from my fellow Canadian islander if I ever get out there, that steel fixture he has on his rotary table