highpockets,
You may have already covered what I am going to say below.......
How many KB is your cfs2.gsl?
Stock default is 263KB.
If your GSL folder CFS2.gsl is only 263KB, default objects are the only things which will show without a layout file with them in the LAYOUTS folder.
Also, one of the things I have found very helpful in MBing is to move all of my (airfield)_AFD bgls into: C:\...\Microsoft Combat Flight Simulator 2\SCENEDB\afdfiles\scenery folder.
Without being able to actually look at your separate folders within Combat Flight Simulator 2 main folder, it is difficult to pin down what is going on.
I don't have that campaign on any of my installs, so I cannot know exactly what you have and have not gotten done.
Did that campaign come with gsl files to install using GSLMan?
If so, did they install correctly and increase your CFS2.gsl appropriately?
If not, did it come with layout files to make the scenery objects visible/usable?
Does your main Combat Flight Simulator 2 folder have an "error.txt" file sitting there?
If so, what does it say you are missing?