Those screens look mighty fine to me, but as you pointed out and i checked, that project is all but dead. And screens can´t show you what the performance will be. Taking stills is one thing. Playing the game in it with a steady framerate is another.
And i don´t see anything in the screens that can´t be replicated by the Doom engine, the Unreal engine, the HL2 engine, or any high ranking engine out there.
If i had to choose an engine to play around with, i would choose the one wich gives the best results in spite of the PC used. Not many people have a system that can handle the load Doom 3 dumps on it. My system is medium to high performance, but i still had to play Doom on the lowest of settings. And everytime i got into a firefight it was like watching a slide show.
Anyway, is there anyone around from the FSFPS project? Is there a website, or something?