I also have had the pleasure of working with Serge to outfit two mounts built in the last Century made by Ed Byers. He asked questions and had very good suggestions. I settled on 311,000 tik encoders on both the Series One mount and the Byers 5-8 mount. This provides a much greater pointing accuracy than the 8k encoders I was using with a Lumicon DSC unit.
Serge really helped us with the installation of the system by making some custom mounting brackets, using a 3D printer, We just needed to give him a drawing with accurate dimensions. The mounting brackets fit perfectly and are very durable
Personally I enjoy very much working with Serge who is helpful in every way.
(There are photos of my Byers Series One mount with the 3D printed attachments, on current the SHOW US Pictures of your mount forum )