About two years and one half were needed to make this mod possible. It modifies and improves greatly every aspect of Stalker: Clear Sky, excepted the main storyline and side quests which remain unchanged. See the full changelog for more information.
Some people have reported this bug of the messed up Ui. For some unknown reason, the only way to fix that is simply to increase various video settings (textures detail, specially) until the proper Ui is back again. I know that certain people cannot play this mod on high settings, but I haven't found yet another solution to counter this annoying bug (if you are experiencing FPS drop after doing this, then try to lower some other settings, like sun quality, etc...).
You will notice that this issue may not only happen with The Warmongers, but also with several other mods as well.