I can remember building both the Revell and Renwall kits many years ago - long before Revell acquired the Renwall molds. The Renwall one was considerably larger (I have no idea what the actual scale was), and, by my recollection, had a hinged starboard hull half. In the smaller Revell kit the starboard half of the hull snapped on and off (at least for a while). Both versions, I believe, originally featured metal springs in the foremost Polaris tubes so the missiles could be "fired." (If I remember right, the Revell "firing" mechanism consisted of a couple of sliding plastic rods that protruded from the base of the conning tower, whereas Renwall's had a little trigger at the base of one missile tube.)
I think the Renwall kit appeared at least once with a starboard hull half that, in addition to being hinged, was transparent. Both kits were great fun for a kid in grade school or junior high. I remember being blown away by the separately-molded pieces of meat in the meat locker of the Renwall kit. On the other hand, the Revell one had beautiful decals to represent the instruments in the control room.
Dr. Graham's excellent book, Remembering Revell Model Kits, explains the story of the smaller Revell version - including the fuss Admiral Rickover made over it. (In retrospect, it looks like the admiral was deliberately creating a red herring. He surely knew that the interiors of both those kits bore little resemblance to reality.) Here's the entry for the kit, from Dr. Graham's appendix:
"H-365 USS George Washington "S" 1959-60 1/253 $60-70 [that's Dr. Graham's estimate of what the kit might bring on the collector's market today]
"Gray, black, light green plastic. Decals for interior. Right side of hull snaps off to show interior. The two forward missile tubes have opening hatches to launch missiles by metal sring power. Includes fold-out booklet by General Dynamics Corp., The Story of Our Undersea Nuclear Navy. The fist issue of the model inaccurately holds only eight missile launch tubes, but this is corrected to sixteen in later isues. Rissued as: H-313 Abraham Lincoln (1961); H-425 Polaris Submarine (1962); H-433 Patrick Henry (1968), H-437 Polaris Submarine (1976)."
Dr. Graham's coverage stops in 1979, so the book doesn't mention the Revell re-release of the Renwall kit.
Incidentally, I had the pleasure last week of buying Dr. Graham's new book, Monogram Models. Highly recommended - another terrific, well-researched exercise in nostalgia.