Hi Carl. I can give you a little bit of the middle of the story on that car but unfortunately I won't be much help with the most important part of your quest which is in regards to who owns it and how to contact them.
We know that the car was in Canada for many, many years languishing outside behind someone's house. It came up for sale a few years ago during the two years when Bob Welsh (from Delaware) owned the molds for the Sterling. During those two years Bob went far out of his way to collect up on a few of the rare variations of the Sterling and Cimbria derivatives including that Viper 2000 and also a white Fortvac Bernardi. I was in the shop during the conversation in which he was trying to justify grabbing and importing that Viper 2000. Everyone in the room was fascinated by it. I definitely was, but I was intimidated about the challenge on getting it into the US from Canada. Also, Rick (Letterman) had scared me off by its engine insofar as that it's an expensive, finicky engine (and the one on it was shot.)
Anyhow, we were thrilled that Bob got it because we felt like he had "saved" it from rotting behind someone's house. The car came to a warehouse (Bob's shop) in Delaware for maybe about a year. During that year, Bob had some other projects going on that took his focus away from Sterlings and Cimbrias which eventually let to him letting go of several cars, including the Viper 2000.
If my memory serves me, I think the car went someplace far away, like overseas. Rick often has a few more pieces of various Sterling/Cimbria puzzles and he might have one or two more details. I suspect he'll find this posting within 24 hours and will add to it if he has anything.
It would make sense that Bob Welsh would remember or have a record of who that car went to. Unfortunately, we haven't actually heard from him in more than a year. We're hoping he is okay.
Anyhow, I know this doesn't solve the mystery for you but hopefully it gives a few more bread crumbs.
Here are a few photos of the car in Bob's shop. The time stamp on them was November 2013. Man, time flies.
(As a bonus, you can spot the Bernardi in the background as well as long time Cimbria super-enthusiast Fuzz.)