Interesting reading Vernon, I think you can get too caught up in trying to do things "by the book" when in reality people were preserving and flavoring food in this way well before the book was written.
I have made further modifications to the Brinkmann, a couple of phots below.
I used a palette knife from the kitchen as the cover for the new air holes. I need to get hold of a good high temp paint I think now just to cover up the areas where the paint has cracked away during drilling. I could have been a bit neater with the holes, but figured it was underneath, so who was going to see it, and now I am posting picsof them!