Great recreation, JB.  A couple observations:

-Sinnott is of course a terrific inker, but I'm always surprised at how easily I can tell it's his line.  That is to say, I think he overpowers the pencils a bit, which is something I've not heard you have a problem with.  Someone like Joe Rubinstein seems a lot harder for me to identify his inks (meaning that he seems to retain the original pencils more for each artist he inks; see OHOTMU for good examples of being able to identify the underlying artist), yet I seem to remember you mentioning that the art was changed somewhat.  Perhaps details that the reader would never have noticed were there?

-I love your enhanced modern detail, but I have to say I prefer the fewer distinct rock plates of your older Thing compared to the higher number in your new (which also includes a higher number of textures in each individual rock plate).  There's no question the new style is more detailed and better, but I think the look of the Thing is altered somewhat in favor of the newer style.  Long story short, today's recreation Thing looks more like "my" Thing than does the older modernized recreation you posted as well.

Edited to add: besides the number of individual rock plates, I think it's perhaps the variable size of each rock plate.  In other words, your older Thing would have larger rock plates on his pecs, thighs, and back than he would on his smaller limbs, etc.  The new one seems to have similar sized plates all over.

As most of the readers, the first Thing I saw was the "definitive" one (in a 1979 issue drawn by Sal Buscema).

When, years later, I finally read FF #1, I couldn't believe that scary character was the same I knew!
I had similar experiences with origin issues of Spider-Man (never heard about this Ditko guy before) and Daredevil (a yellow costume?), but it was nothing compared to the impact the original thing had on me. I tried to imagine how he had to feel... he and his 3 friends, of course. And it was a bad sensation!

JB - My opinion is that it would be nice to have some sort of acknowledgement to Sinnott on this piece. Especially since, as you say, he was working from your breakdowns, and so created the look of the plates of the Thing. If he was working more as an "Inking Robot"* I would think it didn't matter as much; but even then, the inker almost always has some effect on the final piece.

* As Terry Austin has referred to himself!