Andy:

Please consider running the pc trace from Pin 18 of the PIC to Pin 8 of the
AD9850 over near the edge of the board and putting some extra contact pads
on the line so it will be possible with minimum risk to get at the FQ_UD
line for external coherent control of the signaling events.  I would also be
prepared to pay a bit more for the board if you had a prototyping area on
the edge of the board, say about 50% of the size of the basic board.

Larry
VA3LK