I believe I met the former owner of the Rotorvic 23B during the car's previous stay in Utah (USA) in the late 1990's. I did not get to see the car but I did get introduced to the owner's website, which has some information on the car, here:
http://www.utahlotusmuseum.com/id115.htm
No period photos of the exterior of the car, alas, but there is a most interesting period engine photo and accompanying article from the February 5,1965 issue of Autosport, here:
http://www.utahlotusmuseum.com/id123.htm
A fascinating project! Best of luck to JJD.
[Edit: this is my first post here, so apologies if external web links are not permitted here -- if so, moderators please feel free to remove my post!]