You can load a background image as a watermark in Window > Styles > In model (the little house icon) > Edit tab > Watermark settings. There you can play around with the settings (stretch the image for instance) etc. Make sure to have some colour for the ground otherwise the background watermark will see through your ground.
Edit:
Here is an example I have just made with the fist image (rather kitschy) I found on the net. Obviously there's a kind of "visual contradiction" (to say the least) between the "photo-realistic" sky and the sketchy ground plane and model itself.
Did you make your resolution bigger or smaller? What if you reset it? If they appear,just undock them somewhere in the middle, resize again and start docking them back where they fit.
The DWG export uses exactly the same units you are using to model with. The units can be changed on the fly from the Window>Model Info>Units pane. No need to export, copy over etc. Your model and the "real world" stay in sync.
sometimes that has something to do with layers. did you get a whole bunch of layers, when you imported?
if yes, some of them may be hidden. the easiest way to get your model a bit more clearly arranged is to select them all (except layer0) and delete them. SketchUp will ask you, if you want to move the contents to the default layer (layer0). Confirm.
.HELLO,
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Its certainly a strange problem, and i think its must vary with the amount of memory youve got available, as toxic suggess.
I just had a quick play around and managed to export up to about 4500 with AA on, also had the task manager open at the same time, and SU does use a load of memory when exporting these big pics.