Regarding one of the engineers from ECE the total number of converted Elise’s is 11, One was totalled during testing. I was able to find 8 out of 11.
The first Lotus Elise ECE, not registerd

First Lotus Elise ECE
Athlon 28-HXD-2 first registration 6 april 2009, White

White Lotus Elise ECE 28-HDX-2
Enexis 87-HSZ-7 first registration 27 March 2009, Blue with White wrap

Enexis Lotus Elise ECE 87-HSZ-7
Elipa 71-HXR-7 first registration 19 march 2009

Grey Lotus Elise ECE ELIPA 71-HXR-7
86-HTB-1 first registration 14 april 2010 Black

Black Lotus Elise ECE 86-HTB-1
76-HXR-7 first registration 10 April 2009, Green

Green Lotus Elise ECE 76-HXR-7
RWE Lotus not registerd

RWE Lotus

Grey Lotus Elise ECE 50-JDX-8
50-JDX-8 first registration 27 april 2009, Gray