PE,
All joking aside! Could not one follow the exact same designes of your coating devices , but make them in plastic or glass? Material cost would be much lower, at least. You could break up the overall shape into simple shapes,have them fabricated, then cement them together. True, this would not be as precise as your machined stainless. But do we realy need that degree of precision? I ain't trying to " beat a dead hoarse". But,after all, you brought it up again.
Bill