OR75 Thank you for your comments. The reason why I followed Brad's posting was my plane has similar avionics and I was thinking of doing a similar avionics upgrade in a piecemeal fashion. I liked Brad's solution of stacking the flightstream 210 with GAD-29B behind the panel and above the nose wheel well. As for the CIIB, I would like to replace it with a GFC-500 but who knows when. Again assuming the new GSA-28 roll servo went in the same location as the CIIB servo, my daisy chained CAN harness could then be looped backed to tail to the pitch servo. That was what I was thinking when I asked the question.
Best regards,
Hank