Marty
I have used this design often, as a designer.  I supply the
manufacturer with art-work that is used to cut the perpreg that goes
between the board and the plate,  allow for flow not to cover
pads.  This saves a lot of manual clean-up. No solder mask under the
prepeg.  I have used up to 0.025" of  prepeg. If you contact me
off-line I can give you more contacts for imformation.
Rodney Brand
205/837-9877x153

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