Radiation Alert: Episode 1 is already finished. I want to upload the file. It is a classic Half-Life mod. In my opinion well done. Installation instructions are on the download page
While quite detailed and entertaining at times, this mod has overwhelming problems.
There is an odd mixture of high definition models mixed with low definition models and textures and most of the maps have serious frame-rate issues, making progression on higher difficulty's almost impossible.
That being said, it looks like the mod was a work of love, considering how much detail is present in every map. If only the Gameplay and optimization stood up to the mapping quality :(