I'm guessing that something heavy is scripted to go down at the Silver Rush at some point in the game (no spoilers, please), as when I've come to add some spankin' new energy weapons (Y2KB Pulse Rifles, Pulse Pistols, etc) to the place via the GECK, well...there's not an awful lot displayed there. All the furnishings, like shelves and tables that you can see by entering the establishment, are listed in the Cell View objects list, it's just that very few of them are displayed in the GECK viewer. Neither are any other building essentials, such as walls, a floor and ceiling.
How the heck do I carefully place these premium display pieces when what I want to place them on are invisible?
If you'd like to take a look for yourself, set "World Space" to "Interiors" and browse to the Editor ID "FreesideSilverRush".