It has more detailed info on how to create a layout. I actually did a couple myself, the newer editor is much easier to use. Once you dig in, you may be able to at least get started, and Youki can help.
I just spent about 5 hours tonight trying to "learn" atomic, and Ill tell you, I just dint know. I really want to use it from some of the videos Ive seen, but I really dint like the "parochial" look of most of the layouts, plus I need a layout in 640x288 for the monitor. I attempted to try and make what I'm envisioning, but I just cant get it.

After giving up on that I figured Id try and at least get it running with the standard layout - Still cant get anything to load. I guess I'm just going to go back to MALA.

Its a shame too, I can see a whole bunch of potential for what I want to do. I just want an arcade - no jukebox, video, or karaoke machine - just something to play arcade games on.
V~