Before I post the next series of photos, a small description of the Central Fire Control (CFC) or Remote Control Turret (RCT) system as used on the B-29 is in order. A great description and excerpts of the manuals can be found here:
http://www.twinbeech.com/CFCsystem.htm. Thanks for compling all this information, Taigh, and yes, there are some of us out here that think like you do!
(Oh, I think we DO have a life, it's just a little on the eccentric side!)
In a nutshell, the tail gunner was independent of the rest of the gun system and was isolated in his little pressurized compartment. The nose gunner, top gunner, and both side blister gunners could take control of the other four turrets by use of the computers that ran the whole system. Priority could be changed from gunner to gunner depending on where an attack was coming from. The top gunner was a kind of "master of ceremonies" and was known as the "RCT" gunner according to my Second Air Force Standard Procedures Manual, the left blister was gunner "E", and the right gunner was "M". In order for the CFC system to work efficiently, coordination between the four men working the gunsights was absolutely essential. The various B-29 training fields devised different training systems using a variation of the Waller Trainer, which used movie footage to simulate airplanes attacking the "airplane". Harvard AAF eventually constructed a procedures trainer in the Gunnery School building that had small compartments for each gunner, a working intercom system and enough of the RCT system to allow for a fair representation of a B-29. This system was still not good enough, and the outdoor mock-ups began to sprout.
Here is the pair that Taigh posted earlier, that I think was at Clovis.
Fairmont AAF wasn't quite as efficient, as this was their first effort, and it only trained one crew at a time. However, it actually had turrets mounted on it, whereas the first picture shows only camera scoring ports. If you study this picture a little, you'll see the putt-putt that powered the electrical system.
McCook AAF had some ingenious folks in the Gunnery School. 2AF had wisely decided to let the personnel at the training centers design a system that got results, and, after a time, enough fire control equipment and spare turrets, sights, and cracked blisters were available to get creative. Here is the McCook Outdoor CFC Mock-Up in September of 1944:
This trailer was towed to an unused runway or taxiway and pursuit curves were flown by L-5 or other aircraft on the trainer. Two crews could train in this device, which had two complete RCT systems and two independent fully functional intercoms. The instructors would introduce malfunctions into the system during "combat" and the crewmen would attempt to repair them during the fight. By using the mock-up the gunners could learn how to cooperate with their shipmates and each man's idiocyncracies. The gunsights were equipped with standard gun cameras and the film was developed for grading and debriefing, usually on the day following the training session.
Harvard eventually built their own Outdoor Mock-Up from a 2AF basic plan. This image was taken at the Harvard Army Air Field open house in the summer of '45:
This trainer used a bit different design to achieve the same results as the McCook trailer, but was constructed much later. How about that sporty P-63 in the foreground!
It's a gunnery training airplane that probably "attacked" that very trainer. More on the Kingcobras later.
To illustrate the ever-changing plans with the B-29 program, McCook used their trailer mock-up to assist in Second and Third Phase Training for the 9th Bombardment Group (VH). The next unit assigned to McCook was the 331st, equipping with the turretless B-29B. Since there was no need for the CFC trainer anymore, McCook's Base Unit was ordered to ship the mock-up to Colorado Springs, and to send all turret training aids from the Gunnery School to other B-29 stations that needed them. This also happened at Harvard, Grand Island, and Fairmont. Well---after training the 315th Wing Groups, the AAF decided that the next combat units to train at the Nebraska fields would once again employ the full CFC system! The four Gunnery Schools were instructed to set up proper RCT training aids in preparation for their next Group. McCook immediately requested that 2AF H.Q. send back their cool gunnery trailer, but the request was turned down. It was during this confusion that Harvard constructed the trailer in the photo above.
As an aside, the next four groups scheduled for these bases were intended for the 8th Air Force then setting up shop on Okinawa under General Doolittle. The 316th Wing would have gone to battle with fully armed Superforts equipped with AN/APQ-7 bombing radar and the APG-15 gun laying turret, but the end of hostilities meant that the program never reached full speed. Consolidation of units and closing of airfields saw most of this newly acquired training equipment unused or shipped to the few training fields still in use.
Scott
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to this in 3 months: 
Help us get her all the way back 
Don't encourage him, Taigh!!! 
Gary