FS2002-editing/removing default scenery

I am customizing Panama in FS2002 to match late-1920s features, and
the
problem I am having is that default skyscrapers are appearing in the
middle
of the most prominent hill in Panama City when I add the SRTM terrain
mesh
(which is a lot more accurate than the default terrain-- I am living in

Panama, so I get to see first-hand). I have tried everything I know how
to
do (operative words), including turning off the Central America default

scenery-- that eliminates the Panama Canal, and I would rather not have
to
recreate it. I am using Derek Leung's FS Scenery Creator (version
1.5.2)
because it appears to be the most user-friendly.

**Ideally**, I would like to be able to find the default .bgl file(s)
for
Panama and modify them to eliminate whatever I don't want-- any
suggestions
on what I can do?

Thanks for any advice.

Scott Anderson