That Jason Sloan guy has updated his site, Doom Arena, with news related to him on a couple of fronts. First, there's the NewDoom Community Project, of which he has signed up for three maps. Then, there's the third spectacle in his Spone series, a set of Legacy single player maps with a "touch" of 3D, which he has begun working on:
The detail is going to be ten fold over anything I have done before. For instance in one room there is a sink with a towel drapped over the top and hanging down the side. These little things I think give a good feeling to a map.