Thanks for checking it out, Bill!  Calling me "IS" is fine.  Aside from being a hobbyist CGI artist, I'm also an aspiring writer and linguist.  "Iuvenis Scriptor" means "Young Writer" in Latin.

I am aware of the utility of Blinn, and for the longest time I did use it.  I just decided on a Fresnel-powered Specular node for that extra bit of accuracy that you gave me the impression such a move would yield.  Given your most recent clarifications on the matter, however, I may yet put an addendum on the tutorial explaining that a Blinn node, with or without an Edge Blend, would be a reasonable substitute.

Thank you also for alerting me to the units issue.  I use default, which I believe is US Customary.  I'll add that info as soon as I finish my homework for my Spanish and French classes. Might it be a good idea to indicate my render settings as well?