From what I remember muz did in fact did some pirating with the trains. As for the video, its not clear enough for me to see.
You can find the R46 exterior in the train objects on JayJay's folder, or use the old R46B for the U (I'm not sure if we still have it up) Then set that to be an exterior. There are guides somewhere, but I cant recall from where right now.
The R46 was in fact one of the first trains to attempt to create an exterior with OpenBVE's introduction though. Its a shame alot of the innovation that occurred here doesn't really get its credit.