Steve,
Have you thought of using Kapton (adhesiveless -offcourse) to build the brd with. THis is very proven technology (rigid-flex). Pricy, but can't imagine it to be much more than SpeedBoard.
We have build brds with Kapton to provide thin brds w/ high layer count. Benefits:-
1) Er of 3.2-3.6.
2) Can use 2 mil thick material.. 2 mil thick has been used in rigid-flex for years.
Call offline if you want to discuss further.
Rush
818.768.3919
www.accueng.com
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