Hello mustang and thank you for your posting.
You write about the practice about rebinding a copy of the NWT with the book _Make Sure of All Things, Hold Fast to What Is Fine_. Let me say for the benefit of those who weren't associated in the early 1970s that it was a common practice at the time. The purpose, of course, was to bamboozle the householder into thinking that the smooth answer to a question came straight from the bible when it really was, at best, a bunch of unrelated scriptures strung together in typical WTBTS fashion.
The rebinding job was usually quite clever with a black leatherette cover with the words "Holy Bible" in bright gold lettering on the cover. The fact that it was two books stitched together was undetectable, and there was, as expected, no mention of the "New World Translation" on the cover.
I can only assume that the scam was thought up by Brooklyn, as the _Make Sure_ book was the only one that used the same bible paper and was the same size as one of the "economy" green cardboard cover NWT bibles.
An even cheaper approach was the thin booklet _Sermon Outlines_ which was designed to be glued inside the back cover of a copy of the NWT, or perhaps inserted between the Old and New Testaments.
Did this all really happen? Yes. Is it sleazy? Yes. Are any of you surprised? I doubt it.