Years ago I once spent a fascinating couple of days at work reading through a very long text heavy website about the interior design of the Falcon.
It seems that there hadn't been much correspondence between the interior set designers and the exterior model designers and AFAICR no real drawings showing how the various compartments, gun positions, corridors and engine spaces fitted into the hull.
Obviously any links I may have saved have long gone so I have no idea where to find all this again. All I can remember was that it was on a site which looked at the designs and specifications of all the ships seen in ANH, TESB & ROTJ.