The owners of OE-CSI (formally G-CDKJ) Bert and Wilfried, have sent me some pics of their D-Motor install so far.
When it is up and flying it will be interesting to hear of the performance figures and if there are any issues. I did consider the D-Motor when building mine but it does not offer inverted oil so I did not go with it.
Wilfried also contacted me to let me know that they had the same issue as me with elevator play, on the Port side only. This was at 200 hours.