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Those OSHPark rules are 6mil, not mm - that's a little over 0.15mm. But it's still not really suitable for BGP modules. You can probably do 60-ball RAM modules, but a medium-sized processor seems like it would be off the table.

I think that dirtyPCBs does 6-layer boards, but they're comparatively pricey for small runs or prototypes.

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Thanks for the correction; I thought 6 mm sounded way too high. Gotta love American measurement units!

There are Internet accessible Chinese PCB manufacturers that will do short runs for designs of almost any complexity, but they aren't really targeting hobbyists, though that seems to be changing.

Yeah, mils are a really strange measurement unit. I'm not sure who thought that 1/1000" would be a good standard.

I think it harks back to older manufacturing processes, via plastics (where mils are used) back to metalworking. Machinists will usually talk about small distances in "thou", as in thousandths of an inch.

Always cracks me up when AvE mentally converts 2.5/64" or some crazy shit into thou while thinking out loud, and then goes "metric fanboys be like whaaat?"

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