The clock face was created over a core of 1/4" plywood. Two sheets of brass were epoxied to the core and the edges folded over and epoxied to the back.
I originally attempted to epoxy the stainless steel to the brass, but after a messy failure with that redesigned the face so that the steel could be held down with small machine bolts. Using a drill press and lots of clamps the steel was centered and fastened to the core.
The drill press was used again to drill out the holes for the leds, which were then hot glued to the core.