When I bought the ET frame from a guy, he asked if I could send my frame to him... I must have had a head injury at the time, because I did.
I posted about this recently in the Voided Warranty forum (which was the wrong place to do so :p ), asking if anyone had a spare Nova frame sitting aroung.
I got the ET frame going, but it still required some tweaking with the timing of the solenoid, if I remember correctly. It would shoot quick and was like clicking a mouse button, but I missed the old frame, b/c that had the classis Nova pull - real smooth.
Really cool gun
Even though I don't have the original frame, it is rarer I suppose, b/c of the long barrel and ET frame. Shooting it with the shroud off is just freaky though