There are no D models in service anywhere.
Sikorsky has, for the last 40+ months, been battling to overcome troubles with the integration and performance of the Pratt & Whitney PW210S engines including some specific problems encountered at altitude (although Sikorksy themselves have not been in a hurry to publicise this). However, those working on the programme are well aware that this has been a major issue.
Not sure about the interiors. Some of the VIP configurations will be available from multiple vendors/locations while both VIP and utility/offshore interiors will also, as far as I know, be available ex-Coatesville.