Well, I replaced the two lower chain tensioners with the new updated parts (which incidentally, did not have external springs) trying to eliminate the whince inducing start up rattle. The result, no change whatsoever. I thought I had nailed it because when removing the old IMS tensioner, it was completely slack. So I'm glad I replaced the tensioners, but it did not solve the problem.
Incidentally, the video below is exactly the type of noise that my car makes, occasionally, on a hot start up, after the car has not been up for about an hour. The start up noise from a dead cold start is similar, but not quite as loud.
enginenoisemovie - YouTube