Most any good MLB house can do the 3 oz. internals. It's just you're going
to have a lot of interesting things happening on the outers. The etch factor
and resulting trace profile (z axis view) would be very interesting even if
you could stack enough photo etch resist that high.

Used to do thousands of 8 oz outers for a MIL program for a company in Salt
Lake I can no longer remember the name but for Wendell Giles, the buyer, and
Arnie Smith, his boss. Because I said yes to the order, and they gave it to
us (I do remember this company's name), Wendell, Arnie, and I got new
offices next to the flusher.

MoonMan

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