Bin801,
I do not know what to tell you, there are three B-52's at my EDW, two are black and one is white with NASA markings, none of the three are partially covered by buildings. The SR-71 should have landing gear, but there is no building, lamp or fence by it. The X-15 should have a complete body and it is mounted on a pedestal. In your Scenery Library you should have Mega Scenery then Edwards AFB the other cities and ending with Reno, after Reno you should have Addon Scenery and then Propeller Objects, hope that this helps.
When you unzip Edwards AFB Scenery Additions you have a folder and that folder has two folders, scenery and textures. The contents of these two folders needs to go into their respective folders under Addon Scenery in FSX
When you unzip the BGL update follow the directions, the bgl file needs to go in the cities\edwards_afb\scenery folder under FSX.
Regards,
Rod