i know there is a person in US an indian named Mr.vardhan who has come up with its the same you are reffering to its called a muskket. if you want a link to his website i can provide it to you. however in his page he clearly mentions that he doesn't ship it to India as customization of vehicles is not possible in India due to legal hassles.
i have often drooled over this machine that you have mentioned. i think there was another person Mr. carberry who had come up with the V-twin wish our authorities would allow engine customization. that would bring about geniuses in India.
also i wonder what has stopped them in bringing back the parallel twin that they had in interceptor. i know the emission norms were holding it back but with the evolving of technology and so called R&D of Enfield i wonder why Mr.Lal cannot come up with the same twins with refined emissions.
here are a fe pics of carberry enfield
also i hear Ex-Ducati designer has joined the board of Royal Enfield Mr. Pierre Terblanche seems to me that some exciting times for Enfield lovers is on the cards.