Hey Ed,
Its coming along nicely! Steady on.
When I would do scenery, I would take a aerial screenshot of the ground below, then go in and install the screenshot onto a polygon and make that the ground. Then simply make the buildings on the ground bitmap and also use that to place your trees, cars, and other scenery elements in there too. Export only the scenery objects when compiling, leaving out the ground terrain 'template'.
EDIT: On larger airfields, I had to do a wild system of adding in scale by using towers that were a certain distance apart. I placed these in the scenery (in FS) and then photographed it from above. I could then 'scale' the area (aquire dimensions) for what it would be in Gmax, and then in Gmax, scale and space things appropirately and begin building the model of the airfield from there. Before I did this system, scaling things was very difficult. Afterwards, it made it much easier. For me, anyways, lol...
Also, in mapping buildings, you can do a 'tile map' on a part to give it say bricks all the way around the sides. Then photograph 'that' and shade it on the sides in Photoshop, then create some unique building textures. Works really well. :d
On the one below, I did this, and also created an inner wall mapping (shaded area version) by using 'Inner Shadow effects' in Photoshop on that one layer area. I also copy/pasted in some windows over the texture. Special Effects in PS can really quickly add some neat little details of realism that add to a texture. Airbrush shading and highlights can also help make a texture look more realistic.
Bill