DT,
This build gives me a nervous twitch... The six layer build of all 2 ounce
layers:
.0028 x 6 = .0168; add plating to surface (.0013 x 2 = .0026); Cu total =
.0194
Foil build using .004 core between 2/3 & 4/5; .006 thick on the rest = .026
Total board thickness is right at .05 on the six layer config and tuff on the
eight.
I would send out for quotes before you go to far down the road of commitment.

Keep in mind the adjacent copper's need to fill with prepreg's resin is
substantial and will differ with personality; plane, mixed plane or trace.  I
do a lot of "heavy" copper boards and I may be alone but my attitude is 2
ounce copper is heavy.  In days gone by (prior to single ply cores, and thin
dielectrics) 6 or 8 layers in an .050 PWB was a "no brainer"... no way!
So... if you have some "old guy" that has hesitation this may be why.  [Old
guy being nongender and 6+ years experience.]

I can go on and on with this subject but as a Holiday gift to all I will just
say Season's Greetings.

Sincerely,
Boston Brad

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