The new Trumpeter 1/48th A3D/A-3 kit has been eagerly awaited by some. Here is some detail on the main landing gear wheel wells, which are more prominent than on most airplanes.
There is an opening at the forward end of the wheel wells that goes straight through to the other side of the airplane. This opening is required to accomodate the landing gear retraction actuators.
The retraction actuators crisscross in the opening, with the left strut's actuator mounted forward of the right strut's. (This picture is from Darren Tamanaha's walk around photo collection that isn't accessible now; for a substitute, see Howard Mason's: http://www.primeportal.net/hangar/howard_mason/a-3b_143359/)
http://tailspintopics.blogspot.com/2010/09/mighty-skywarrior.html). There are several notable differences, including the main wheel brakes: