The rar file should be setup so you only drop everything right in fh2 folder.
But here an example
fht2_pub folder goes directly under battlefield 2\mods\fh2\
all fht2_levelname goes under battlefield 2\mods\fh2\levels\
localization folder drops into battlefield 2\mods\fh2\ (it will ask you to merge with the current localization folder, but don't worry, it will not actually overwrite any files in there)
And it's not only a few buildings missing trainz, the whole troina city and most of salerno will be missing
+ you won't be able to play online.