I hadn't spent much time on the ERA-3B because it was restricted from carrier operations and fulfilled a vital but peripheral Navy mission, training the crews of Navy ships and aircraft to operate in a hostile electronic-warfare environment.
All eight ERA-3Bs were originally delivered as A3D-2Ps, a photo-reconnaissance "Version" of the A3D-2 bomber. Like the other Versions, the interior had been permanently rearranged to provide a cabin aft of the cockpit.
When the RA-3Bs began to be supplanted by the supersonic RA-5Cs for reconnaissance, four were repurposed in the early 1970s to be ERA-3B electronic-warfare aggressors, BuNos 144827, 144832, 146446, and 146447. Note that the last two were delivered with the Cambered Leading Edge (CLE) wing, readily identified by the addition of a leading edge slat between the wing and the fuselage.
Rick Morgan Photo
Of the original four ERA-3Bs, at least BuNo 146446 and 7 were converted to this configuration.
An excellent walkaround of a near abandoned 146447 by Bill Spidle can be found HERE
Note that the RAT hubs and propellers have been replaced by a conical fairing. It was not unusual to see one or even two RATs on operational ERA-3Bs with the fairing.
The Trumpeter A-3 series continues to disappoint. A detailed build article of the ERA-3B kit (the early configuration) by Philip Cavender is provided HERE
Note that it's missing two of the four RATs and numerous antennas. Not apparent from this angle, but the radome leaves a lot to be desired as well. The cabin is also taken directly from the EA-3B kit, so it has four seats instead of two, but since nothing can be seen of it, that's a moot point.
However, Steel Beach has come to the rescue with an accessory kit for the later configuration (small canoe, etc.) reviewed by Haagen Klaus HERE
Note however, that the ECM pods appear to have the outward bulge along the outer side that is not on the ALQ-76 pods used by the ERA-3B according to Rick Morgan. Another stores option is the ALQ-167 "Bullwinkle" pod, an example of which is in the Revell F-14D kit.
The Trumpeter engine nacelles are inaccurate but might be acceptable to most given all of the other inaccuracies. However, an excellent replacement set is available from HYPERSONIC
The Trumpeter canopy is equally off-putting. Hypersonic has a replacement in work but availability is TBD.
More later after comments are provided by my subject-matter experts...