Most of my information comes various books dealing with the B-29. Last count I had 7 or 8 dedicated to the B-29 alone.
The side blisters were not present on the B model nor the atomic bombers. They had a cover that was flush with the skin of the aircraft. There was a small window in the center but clearly not big enough to sight through. The cover opened inward allowing a single hand held .50 to be used. The B and the Atom bombers as well had all sighting equipment and computers removed.
The standard B-29 and the B-29A had 5 gun stations. One was the bombardier, each waist gunner, the central fire control gunner and the tail gunner.
The B model only had the tail gun present. Almost all B-29Bs were flown by the 315th bomb squadron based on Guam.
The B-29C was never produced but was intended to be used with an improved Wright R-3350 engine.
The B-29D was first converted from a B-29A and was first called the XB-44. It used the Pratt & Whitney R-4360 28cylinder 3500hp engines. This was later improved more and emerged as the B-50. The aircraft still did have the 5 gunner system of the B-29.
The atomic bombers were one of a kind pulled at random intervals from the Martin Omaha production line. They were devoid of turrets and armor, fitted with direct fuel injection engines with reversible pitch Curtiss Electric propellers. These aircraft were selected by Paul Tibbets, the commanding officer of the 509th Composite group. Paul was also the pilot of Enola Gay on the Hiroshima mission. All of the modified atom bombers went strictly to the 509th CG. They had their own separate maintenance facilities, engineering, MP and supply groups as well as their own secluded section of Tinian island. There were only 15 of these B-29s in the 509th CG and on the atomic missions only these B-29s were involved in the direct strikes. General Tibbets is a great person to talk to and I have consulted him many times on my quest for information.
I dont mean any offence but that book sounds like it has a fair amount of inaccuracies.
I have always been facinated by the B-29 and ever since I was little I have collected all sorts of info on the B-29.
Here is a great site that pretty much parallels everything I have said. http://home.att.net/~jbaugher2/b29.html
I have most of the books listed by this websites sources as well as a couple others that deal mainly with the special modifications to the 509th CG's atomic bombers.
Another great website is provided by the Air Force museum. It basically parallels all the information given. Here you can also click a link at the upper left hand corner that will take you to various B-29 models. When you see the pics note the B versions waist windows as well as the same configuration on the atom bombers "Enola Gay" and "Bockscar".
http://www.wpafb.af.mil/museum/research/bombers/b3-29.htm
If I can dig it up I found a website once concerning all the projects post war B-29s were involved in, this included the B-29 "Stratovision" project where they used a B-29 to transmit TV signals from 30000 and made for excellent reception plus other things like fighter conveyors and the first AWACS.
If you need any additional info please dont hesitate to ask, I love the B-29 and literally could talk for hours on the subject!! If theres a question on the B-29 that I cant answer I surely can find someone who will be able to answer it.
Fighter pilots make movies.
Bomber pilots make history.