Final PWB thickness depends on your requirements.  I have built 16 layer
boards in .062 thick.  This could not have been done several years ago.
There are many ways to skin a cat, the following is one example.  It is heavy
impedance high I/O product.  I have also done a double blind 16 layer (8 over
8) in .062 thick.  Today the tuff tuff stuff are those .093+ parts with the
.8mm pitch.
The following was pasted from an excel sheet and I deleted some verbage; the
final board met the .062+/-.007.  I would be able to do a layup for you but
cannot send enclosures via technet [which is a good thing].

Cheers,
Boston Brad


plating         0.0014          Diff Pairs = 100ohms differential
1   top         0.0006               .004 trace width
        B       0.0040          .004 edge to edge
2   sig         0.0006
        Core    0.0030
3   GND         0.0006          Plane
        B       0.0040
4   sig         0.0006               56.109 ohms    .004 trace  Diff Pair
        Core    0.0030
5   sig         0.0006               56.109 ohms    .004 trace
        B       0.0040
6   GND     0.0006          PLANE
        Core    0.0030
7   sig         0.0006               56.109 ohms    .004 trace
)       B       0.0040
8   sig           0.0006                 56.109 ohms    .004 trace
        Core    0.0030
9   GND     0.0006             PLANE
        B       0.0040
10  V3p3        0.0006      PLANE
        Core    0.0030
11  sig         0.0006               56.109 ohms    .004 trace
        B       0.0040
12  sig           0.0006            56.109 ohms .004 trace
        Core    0.0030
13  GND       0.0006        PLANE
        B       0.0040
14  sig           0.0006                 56.109 ohms    .004 trace
        Core    0.0030
15  sig         0.0006               56.109 ohms    .004 trace
        B       0.0040
        B       0.0025
16  bottom      0.0006          78.776, 71.53   .008, .010
    plating     0.0014
                0.0679