I have some bad news.
Since Lord Tirian told me how I can see how much triangles a model has, I had a look at how many polygons the graphics currently in Planetfall use. And I discovered a lot of the graphics have much more polygons than I'd expect from glancing at the wireframe of the model. This includes ALL of woodelf's graphics.
The cause of that is twofold:
1) Some models are made with TriStrips instead of TriShapes. A big no-no if the model gets to 1000+ polygons in complexity so I've been told.
2) Even when in TriShapes, these models have been made much too detailed than is necessary for Civ4. A lot could be done by improving the dds texture instead of having all those extra faces and triangles to the model.
The good news is that if these models were retouched or redone correctly, Planetfall would probably run much smoother, less lag when scrolling over the map etc. I realize fixing old stuff is probably much more boring than creating models for new stuff, but doing it would improve Planetfall a lot.
These are the things that stood out to me during my review of the files in the Pak0.fpk:
Some stuff I put between brackets because at first glance their # of triangles seems to match the model's complexity. But because they were made by the same author who made extremely high polygon models, I assume my first glance could be wrong, and their poly count could be significantly reduced as well.