1. Create your own folder named "Installations" and put it in the main Freespace folder.
2. Create folder "Data" in your "Installations" folder.
3. In the data folder, create "Models", "maps" and "Tables" folders.
4. Put the .pof files in the "models" folder.
5. Put all textures [.dds, .tga, .pcx] in "maps" folder.
6. Open the .txt files, copy all text from both files to one, and add the "#Ship Classes" as the first line of the table and "#end" as the last.
Example:
#Ship Classes
<tables of the stations from txt files. One over the second>
#end
7. Save the file as modular table - .tbm file extension in the "tables" folder. Remeber of the -shp ending. Name of your file should be "Installations-shp.tbl".
8. Launch Freespace Open Launcher, select "Mods", click "Select MOD" and select your "Installations" folder from main Freespace2 directory.
9. Klick "Ok" in the Launcher.
10. Launch fred.
BTW. Both Atlantis and Whitehall are old models, and they have old textures but it's not necessary to work. As I know, Whitehall uses custom weapons like "Terran Anti-Bomber Turret" or "Advanced THT". I don't know why, but they're not included with the model. Change them in the tables into some retail Freespace2 weapons like "Terran Huge Turret" or "Standard Flak".