Ok, so I'm a work-a-holic
I couldn't sit still, so I went out into the shop and made four little knurled knobs with 1/2" hex holes in the middle! I figured it can all go to the plater at the same time, and all the aluminum will be done!
When they return, I will make a little fixture guide block. So that I can press the hex of the stainless adjustable feet into the aluminum knob! That will make it easier to adjust the level of the base plate!