I got another contract that comes in the shop today from a nuclear testing facility, so I've got some special spec requirements for these plate-like pieces!
These parts are straightforward, with a basic contour and wide open height thickness tolerance.
My plan of action will be double stick taping the raw stock onto a fixture plate, contouring, and engraving for the first operation. Then, due to their height, I've got a square that I will bolt directly onto the bed, which I can clamp the plate part onto. I don't have the clearance height in the Minimill if I have them set upright in the vice.
Because I'm using double-stick tape, I can't use coolant, so I will have to carefully step my endmill down, taking very light cuts. I've got the fixture plate all cleaned up and located the part on the fixture by pushing my stock up against temporary pins. I'm all ready to go for tomorrow, and I don't think (knock on wood) I'll run into any issues with these pieces!