You shouldn't really target a particular fab, you should target a sort of "class" averaged from the capabilities of multiple fabricators. Services that shop you

You shouldn't really target a particular fab, you should target a sort of "class" averaged from the capabilities of multiple fabricators. Services that shop your order around basically do this for you, if they bother to quote standard rules at all. This will save you from redesign work, though realistically it's saving you from vendor lock-in and price gouging. Sierra can manufacture pretty much anything... but who can afford them?